PAC 6: Radiation Measurements and Dosimetry

PAC 6 Publications

PAC Meeting, March 26, 2023
L to R: William F. Blakely, Jeffrey J. Whicker [Co-Chair], Wesley E. Bolch [Vice President], Raymond A. Guilmette, Steven L. Simon, Leslie A. Braby, & Richard R. Brey




is Professor of Biomedical Engineering and Medical Physics in the J. Crayton Pruitt Family Department of Biomedical Engineering at the University of Florida (UF). He serves as Director of the Advanced Laboratory for Radiation Dosimetry Studies at UF. Dr. Bolch earned his BSE degree in environmental engineering in 1984, his ME and PhD degrees in radiological physics in 1986 and 1998, respectively, from the University of Florida. He has been certified by the American Board of Health Physics since 1994 and licensed in Radiological Health Engineering by the Texas Board of Professional Engineers since 1992. In 2011, Dr. Bolch was elected Fellow of both the Health Physics Society and the American Association of Physicists in Medicine. He has been a member of the Society of Nuclear Medicine’s Medical Internal Radiation Dose (MIRD) Committee since 1993, a member of NCRP since 2005, and a member of Committee 2 of the International Commission on Radiological Protection (ICRP) since 2005. Within the latter, he serves as C2 Secretary and Leader of the ICRP Task Group on Computational Phantoms and Radiation Transport. He has published over 200 peer-reviewed journal articles, co-authored/edited 14 books/book chapters, and served as author on two NCRP reports, two ICRP publications, and two MIRD monographs.

Dr. Bolch has managed a broad research program including (1) National Institutes of Health (NIH) and U.S. Department of Energy funded projects to construct high-resolution models of the skeleton to support dose-response studies in radionuclide therapy and radiation epidemiology; (2) NIH funded projects to develop scalable NURBS-based and voxel-based computational phantoms of adult and pediatric patients and associated software for organ dose assessment in nuclear medicine, computed tomography, interventional fluoroscopy, and radiotherapy; (3) private company funded projects to develop stereotactic kilovoltage x-ray treatments for age-related macular degeneration and glaucoma; and (4) Centers for Disease Control and Prevention funded projects in stochastic modeling of worker inhalation and gamma-ray exposures following radiological accidents and potential terrorist events. He is the recipient of the 2014 Distinguish Scientific Achievement Award by the Health Physics Society acknowledging outstanding contributions to the science and technology of radiation safety.

wesley e. bolch , Vice President

Jeffrey J. Whicker

worked at Los Alamos National Laboratory as a health physicist and scientist for over 30 y. He received an MS in Health Physics and a PhD in Environmental and Radiological Health Science from Colorado State University and is certified by the American Board of Health Physics. Dr. Whicker is an elected Board Member of NCRP, served as a Board Member of the Health Physics Society, consulted for the International Atomic Energy Agency since 2018 on environmental sampling and remediation decisions, and was on the Editorial Board for the journal Radiation Protection Dosimetry for 8 y. He has been the recipient of numerous achievement awards including the U.S. Department of Energy Secretary’s Honor Award (2020). He is an author or co-author of hundreds of scientific publications, invited talks, book chapters, and presentations mostly on indoor and outdoor radiological air quality and measurements that span issues ranging from worker protection, homeland security, radiological dose and risk assessment for the public and the environment, and environmental quality. His research in outdoor air quality focused on aerosol transport through wind-driven suspension of contaminated soil and the effects of ecosystem disturbance on environmental transport rates. This research has broad implications for both public and ecosystem health.

Jeffrey J. Whicker , Co-Chair

Amir a. Bahadori

is Associate Professor in the Alan Levin Department of Mechanical and Nuclear Engineering at Kansas State University (KSU). He is a Steve Hsu Keystone Research Faculty Scholar, holds the Hal and Mary Siegele Professorship in Engineering, and directs the Radiological Engineering Analysis Laboratory at KSU. Dr. Bahadori earned BS degrees in Mechanical Engineering with Nuclear Engineering Option and Mathematics from KSU in 2008, the MS degree in nuclear engineering sciences (medical physics concentration) from the University of Florida (UF) in 2010, and the PhD degree in biomedical engineering (medical physics concentration) from UF in 2012. From 2010 to 2015, Dr. Bahadori worked at NASA Lyndon B. Johnson Space Center on issues related to astronaut radiation health with emphasis on computational dosimetry, radiation risk assessment, and space radiation detection using Timepix-based semiconductor radiation detectors. In 2015, he began as an assistant professor at KSU, earning tenure and promotion to associate professor in 2021. Dr. Bahadori’s research program is focused on characterization of radiation environments, understanding the response of humans and electronics to radiation exposure using experimental and computational techniques, and radiation imaging. He has been certified in the comprehensive practice of health physics by the American Board of Health Physics since 2015. Dr. Bahadori has served in leadership roles in the American Nuclear Society (ANS) and International Radiation Physics Society. He has been awarded an ANS Presidential Citation, ANS Radiation Protection and Shielding Division Outstanding Service Award, three NASA Group Achievement Awards, and the 2018 Zeldovich Medal for Scientific Commission F.

Amir A. Bahadori

Michael B. Bellamy

is employed at the Memorial Sloan Kettering Cancer Center and is an expert at applying high-performance radiation transport and internal kinetics algorithms to analyses that support patient, epidemiologic, and occupational radiation safety research and excellence.

In addition to his ongoing expert dosimetric support of the NCRP Million Person Study on occupational radiation epidemiology, this Georgia Tech graduate has significant radiation protection professional service and affiliations. He serves as a consultant to the International Commission on Radiation Units and Measurements Report Committee 26 (operational radiation protection quantities for external radiation), a corresponding member on the International Commission on Radiological Protection Task Group 90 (age-dependent dose coefficients for external exposures to environmental sources), and a member on the American Nuclear Society Radiation Protection and Shielding Division subcommittees.

Beyond his technical publications in the peer-reviewed literature, Dr. Bellamy has produced numerous federal agency reports [including for the U.S. Environmental Protection Agency (EPA)-Office of Radiation and Indoor Air, U.S. Nuclear Regulatory Commission, Centers for Disease Control and Prevention, EPA-SUPERFUND, and U.S. Department of Energy]. During his time at Oak Ridge National Laboratory (Center for Radiation Protection Knowledge) he worked on cancer risk estimates following inhalation or ingestion of radioactive materials, dose coefficients for external exposure from environmentally distributed radionuclides, dose-rate and dose associated with exposure to patients treated with 131I, neutron dose to the lens of the eye, as well as models and calculations on the relative biological effectiveness of low-energy electrons, photons, and radionuclides, and on other relevant topics of importance for the profession of radiation protection.

Michael B. Bellamy



earned his BSc degree in physics in 1977 from the University of São Paulo, Brazil; his MSc degree in nuclear engineering in 1980 from the Military Institute of Engineering, Rio de Janeiro; and PhD degree in biophysics in 1990 from the Federal University of Rio de Janeiro. He worked as a postdoctoral fellow at the University of Utah, Environmental Radiation Toxicology Laboratory from 1991 to1995. He has worked for more than 30 y in mathematical modeling of human metabolism regarding intake, distribution, retention and excretion of radionuclides for several age groups for internal dosimetry applications; scientific software design and development including software quality assurance procedures; and interpretation of monitoring data of radiation workers.

He is a retired Internal Dosimetrist from Los Alamos National Laboratory. He was responsible for calculating all internal doses and evaluating the efficacy of Prussian Blue for all age groups due to the Goiania radioactive accident in 1987. He has served the Program Area Committee 6 since 2014. He has served the International Commission on Radiological Protection as a member of the Task Group on Dose Calculations since 1995 and as a member of Committee 2. He is an active member of the EURADOS (European Radiation Dosimetry Group). He has served on the Scientific Advisory Committee for USTUR since 2014. He has published several peer-reviewed journal articles.

luiz bertelli
Blakely W


Blakely W

is a Senior Staff Scientist in the Radiation Biodosimetry Research Program at the Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences (USUHS). He received his BA in Zoology in 1974 at San Diego State University and PhD in Radiation Biology in 1980 at the University of Illinois-Urbana-Champaign under the supervision of his doctoral advisor, Dr. Howard S. Ducoff. He completed his postdoctorate study on DNA radiation chemistry in Dr. John F. Ward's laboratory at the University of California, San Diego. In 1983 he joined AFRRI/USUHS, his present affiliation. Dr. Blakely's research activities have focused on molecular mechanisms of radiation sensitivity, cell-cycle effects, DNA damage and repair, and biological dosimetry. He served as a guest editor for several issues of journals associated with international meetings, an associate editor for the Radiation Research, and Chairman of the NATO Research Study Group-Radiation Bioeffects and Countermeasures. He presently is the course director of the Radiation Biology graduate course at his University.

He also serves as a U.S. representative on the ISO TC85/SC2 (Radiation Protection) Working Group 18 (Performance Criteria for Service Laboratories Performing Biological Dosimetry by Cytogenetics), an assistant professor in the Uniformed Services University of the Health Sciences Preventive Medicine and Biometrics Department, and an senior associate faculty at Radiation Emergency Assistance Center/Training Site. Elected as a Council member in 2003 and is currently serving a second 6 y term. He served as the Program Chair of NCRP 2004 Annual Meeting entitled: Advances in Consequence Management for Radiological Terrorism Events and is currently a member of NCRP PAC 6 - Dosimetry.

william f. blakely



has been a Research Professor at Texas A&M University since 1996. His previous experience includes Biology and Chemistry Department Staff Scientist from 1971 to 1991 and Radiation Physics and Chemistry Section Manager from 1991 to 1995 at Battelle, Pacific Northwest National Laboratory. He received his BA degree from Linfield College and PhD from Oregon State University in 1972.

Dr. Braby is a former member of the NCRP Board of Directors and a member of several NCRP scientific committees (SC) including SC 88 on Fluence as a Basis of a System of Radiation Protection for Astronauts, SC 1-7 on Research Needs for Deep Space Missions, chair of SC 1-11 on Safety Considerations for Pulsed Fast Neutron Surveillance Systems, SC 6-1 on Uncertainties in Measuring External Beam Irradiation, SC 1-20 on the biological effects of low energy x rays, and Chairman of SC 6-5 on Safety of Cargo Inspection Systems Using High Energy Photons. He was also Chair of the International Commission on Radiation Units and Measurements (ICRU) working committee on characterizing low level radiation exposure, and member of ICRU working committee to prepare a report on microdosimetry.


leslie a. braby
Brey R


Brey R

Professor of Health Physics, Chair Department of Nuclear Engineering and Health Physics, Director of the Idaho State University (ISU) Health Physics Program. Dr. Richard Brey received his PhD from Purdue University in Health Physics in 1994. He was the recipient of the Elda E. Anderson Award in 2002. He has engaged in a wide variety of research varying from radiation physics and detection to agricultural applications of radiation and radiation producing machines, this list importantly includes internal dosimetry; in which he has engaged in various collaborative efforts including the evaluation of historical exposures, evaluation of animal experimental data, and redefining/evaluating radioactive material translocation models. Since 1995 Dr. Brey has been the director of an environmental radioanalytical laboratory which performs approximately 1,200 sample analyses per quarter. Over the years he has served as the Director of the ISU Technical Safety Office and University Radiation Safety Officer as well as in other administrative and technical positions

richard r. brey

Emily A. Caffrey

is the Program Director and an Assistant Professor for the University of Alabama at Birmingham’s Masters in Health Physics program. She also serves as a scientific consultant to Risk Assessment Corporation. In addition to her consulting and academic roles, she is the Editor in Chief of the Health Physics Society’s (HPS) “Ask The Experts,” the society’s most successful public information and outreach endeavor. Dr. Caffrey also serves on the HPS Program Committee, which develops and manages the technical program of the society’s meetings. She has a BS in Nuclear Engineering and a PhD in Radiation Health Physics and Statistics from Oregon State University (OSU). She is also a Certified Health Physicist. Her areas of expertise include dosimetry, statistics, data management and interpretation, and public communication. She is a recipient of the HPS Elda E. Anderson Award for outstanding early career health physicists. In 2019 she was selected as one of 10 recipients of Oregon State’s Council of Outstanding Early Career Engineers. This award is reserved for Oregon State Alumni who have distinguished themselves through professional practice, service to OSU, the profession, or society at large.

Emily A. Caffrey

Shaheen A. Dewji

is an Assistant Professor in the Nuclear and Radiological Engineering and Medical Physics Programs in the George W. Woodruff School of Mechanical Engineering at the Georgia Institute of Technology, where she established the Radiological Engineering, Detection, and Dosimetry (RED2) Laboratory. Dr. Dewji received her BSc in Physics from the University of British Columbia (2006) and MS (2009) and PhD (2014) degrees in Nuclear and Radiological Engineering from Georgia Institute of Technology, where she was a fellow of the Sam Nunn Security Program. Since 2016, she has served as a U.S. representative on the ISO/TC 85/SC2 - Population Monitoring Following a Radiological Emergency. In 2018, she was awarded the Health Physics Society’s prestigious Elda E. Anderson Award and currently serves as a member of the Board of Directors for the Health Physics Society and American Nuclear Society. Since 2020, Dr. Dewji has served on the Nuclear and Radiation Studies Board of the National Academies of Science, Engineering, and Medicine, in addition to committee member on the National Academies Study on Developing a Long-Term Strategy for Low-Dose Radiation Research in the United States (2022). Dr. Dewji was recently appointed to serve as a member of the International Commission on Radiological Protection (ICRP) Task Group 127, Exposure Situations and Categories of Exposure, and NCRP Program Area Committee 6 on Radiation Measurements and Dosimetry.

As Director of the RED2 Laboratory, Dr. Dewji has spearheaded a robust research program including: (1) employment of multi-physics, stochastic analysis, and machine learning models for uncertainty quantification in internal dose assessment for the U.S. Department of Defense, National Institutes of Health, and National Nuclear Security Administration; (2) consequence assessment from risk-informed physical security and cyber-physical security accident progression analysis for consequence assessment of advanced reactor regulatory siting boundaries for the U.S. Department of Energy; (3) integration of machine learning in epidemiological studies to assess lung cancer incidence from low dose environmental radiation exposures; and (4) adoption of Monte Carlo radiation transport for high-energy physics shielding at SLAC, hybrid deterministic techniques for environmental assay, and modeling of patient release following I-131 radionuclide therapy.

Dr. Dewji additionally brings experience as an Assistant Professor in the Department of Nuclear Engineering and a Faculty Fellow at the Center for Nuclear Security Science and Policy Initiatives at Texas A&M University (2018 to 2021), as well as a 9 y tenure prior at Oak Ridge National Laboratory in the Safeguards and Security Technology Group and the Center for Radiation Protection Knowledge.

Shaheen A. Dewji

Derek W. Jokisch

is Professor of Physics and Chair of the Department of Physics and Engineering at Francis Marion University. He also holds a Joint Faculty Appointment in the Center for Radiation Protection Knowledge at Oak Ridge National Laboratory. He earned his BS in Nuclear Engineering from the University of Illinois at Urbana-Champaign in 1995. He earned his MS and PhD in Nuclear Engineering Sciences (Health Physics) at the University of Florida in 1997 and 1999, respectively, while supported by a U.S. Department of Energy (DOE) Nuclear Energy/Health Physics Fellowship. Dr. Jokisch serves as a member of Committee 2 of the International Commission on Radiological Protection and as a member of the U.S. Scientific Review Group for the DOE’s Russian Health Studies Program. The Health Physics Society awarded him the Elda E. Anderson Award in 2010 and Francis Marion University awarded him the J. Lorin Mason Distinguished Professor Award in 2011. Dr. Jokisch’s research has involved multiple aspects of internal dosimetry, including energy deposition of charged particles in the skeleton, the computation of specific absorbed fractions for reference individuals, the calculation of internal dose coefficients, and the biokinetics of radioactive decay chains.

Derek W. Jokisch

Richard T. Kouzes


is a Laboratory Fellow at the U.S. Department of Energy's Pacific Northwest National Laboratory (PNNL) working in the areas of neutrino science, neutron and gamma-ray detection, homeland security, and nonproliferation. His work on homeland security has been for the development and deployment of radioactive material interdiction equipment at U.S. borders, and for 3 y he was the Principal Investigator and Technical Lead for the U.S. Customs and Border Protection's Radiation Portal Monitor Project, the largest single project at PNNL. His Safeguards projects deal with neutron detection coincidence counters for material assay.

He is a Fellow of the Institute of Electrical and Electronics Engineers, and a Fellow of the American Association for the Advancement of Science. He is an adjunct Professor of Physics at Washington State University.

Dr. Kouzes earned his PhD in physics from Princeton University in 1974. He is an author of over 150 peer reviewed papers and over 400 formal reports and conference proceedings.

richard t. kouzes

Nicole Martinez

is an Associate Professor in the Department of Environmental Engineering and Earth Sciences at Clemson University in the United States. She also holds a Joint Faculty Appointment at Oak Ridge National Laboratory within the Center for Radiation Protection Knowledge.

She graduated from Texas A&M University with a BS degree in applied mathematical sciences, and thereafter became an officer in the US Navy where she was a nuclear power instructor and later a radiation health officer. Followed by a brief stint working in industry, Dr. Martinez attended graduate school at Colorado State University, where she received an MS and PhD in radiological health sciences, with emphasis in health physics and radioecology, respectively. While working on her doctorate, she spent about a year and a half as part of a research team at Savannah River National Laboratory.

Dr. Martinez’s current research focuses on dosimetric modeling and the behavior and effects of radiological contaminants in the environment. In addition, she is interested in non-technical issues within radiation protection, such as ethics and diversity, equity, and inclusion. She is currently serving as Vice-Chair of Committee 4 of the International Commission of Radiological Protection and is the Secretary of the Health Physics Society for the 2021-2023 term. She is the recipient of the 2018 Bo Lindell Medal from the ICRP, the 2019 Elda Anderson Award from the HPS, and is a Certified Health Physicist.

Nicole Martinez

Deepesh Poudel

is a scientist in the Internal Dosimetry Team at Los Alamos National Laboratory. He obtained his MS in physics (health physics) and PhD in nuclear science and engineering (health physics) from Idaho State University.

Dr. Poudel’s interests include internal dosimetry, applied health physics, radiation instrumentation and counting statistics, and environmental health physics. He serves as an Associate Editor for the Health Physics Journal, and as a Topic Editor (Radiation Fundamentals; Instrumentation) for the Health Physics Society’s Ask the Experts feature. He has been certified by the American Board of Health Physics since 2018.

Dr. Poudel has been honored with the Young Investigator Award from NCRP and the Elda Anderson Award from the Health Physics Society, recognizing his achievements in and service to the field of health physics.

Deepesh Poudel
Simon S


Simon S

received a BS in Physics from the University of Texas, an MS in Radiological Physics from the University of Texas Health Sciences Center in Dallas, and a PhD in Radiological Health Sciences from Colorado State University. Early in his career, he worked in medical physics and was the first treatment planner for clinical trials of treatments of solid tumors with negative pi-mesons at the Los Alamos Physics Meson Facility. Later specializing in environmental radioactivity and assessment, he directed the first and only nationwide monitoring program of the Marshall Islands for residual contamination from nuclear testing. He also participated in the radiological monitoring of numerous other nuclear test sites worldwide including Johnston Island, French Polynesia, and Algeria and has lead, or participated in, radiation health risk studies of fallout exposures in Utah, the Marshall Islands, and Kazakhstan.

In 2000, Dr. Simon joined the National Cancer Institute's (NCI) Radiation Epidemiology Branch as an expert in dose reconstruction and led the Dosimetry Unit in that Branch for more than 6 y. His research program included methods for reconstructing historical doses, particularly to medical workers, atomic veterans, persons exposed to radioactive fallout in the Marshall Islands and in the United States – particularly in Utah and in New Mexico, and in the development of methods for characterizing uncertainties of estimated doses and using those uncertainties in radiation risk analyses. He led the first and only assessment of exposures from the world’s first nuclear test, TRINITY, as well as the development of a complete suite of methods for assessing doses from nuclear fallout. He retired from the NCI in 2022.

Dr. Simon has been a member of NCRP since 2006 and the Chair of Program Area 6 – Radiation Measurements and Dosimetry since 2013. He was an Associate Editor of Health Physics for 25 y and, in 2021, was awarded the Distinguished Scientific Achievement Award by the Health Physics Society. In 2011 during the Fukushima nuclear crisis, he was deployed by the U.S. Department of Health and Human Services to the U.S. Embassy in Japan to assist with the protection of American citizens. He was on assignment in 2016 to the International Agency for Research on Cancer (Lyon, France) to develop methods for assessing doses and uncertainties to a study cohort of one million children exposed to radiation from computed tomography exams. In recent years, he has been a consultant to the United Nations Scientific Committee on the Effects of Atomic Radiation for occupational exposures.

steven l. simon

Sergei Y. Tolmachev

is a Research Professor in the College of Pharmacy and Pharmaceutical Sciences, Washington State University, where he directs the U.S. Transuranium and Uranium Registries (USTUR) and the associated National Human Tissue Repository. USTUR is a federal-grant-funded human tissue research program providing long-term follow-up of actinide biokinetics and potential health effects in former nuclear workers (volunteer registrants) with accidental internal depositions of actinide elements. Prior to his directorship, Dr. Tolmachev managed USTUR’s radiochemistry laboratory operations and research in the fields of actinide radiochemistry and mass spectrometry, in support of internal dosimetry and actinide biokinetics research.

Dr. Tolmachev has over 20 y of experience in the development of analytical methods, and in actinide analyses of environmental and biological samples. He is an expert in analytical instrumentation, including various types of inductively coupled plasma mass spectrometers (ICP-MS), high performance liquid chromatography, and alpha-spectrometry systems. Dr. Tolmachev earned his Diploma of nuclear technology engineer (M.Sc. equivalent) at the D. Mendeleev University of Chemical Technology of Russia (Moscow) in 1993, majoring in radiochemistry. His Master’s thesis project was completed at the Joint Institute for Nuclear Researches (JINR) in Dubna, Russia. After graduation, he joined the Radioanalytical Research Group at JINR. In 1997, he was awarded a scholarship by the Ministry of Education, Culture, and Sport of Japan (MONBUSHO) for research and doctoral study at Kyushu University (Fukuoka) in the field of Environmental Radiochemistry/Radioecology. His graduate research focused on 210Po, 36Cl, and 3H determination and behavior in the environment. Dr. Tolmachev was awarded the degree of Doctor of Science (Ph.D. equivalent) in 2001. He continued his scientific career with two postdoctoral fellowships in Japan: at the Japan Atomic Energy Research Institute, Department of Health Physics (Tokai-mura); and at the National Institute of Radiological Sciences, Research Center for Radiation Safety (Chiba). During this period, his research focused on applying ICP-MS techniques for uranium (234U, 235U, 238U) and 232Th determination in human body fluids, actinide biokinetics, and internal dose assessment, as well as on 226Ra determination in the environment.

Dr. Tolmachev is a member of the Board of Trustees of the Herbert M. Parker Foundation and serves on the Editorial Board of the Japanese Journal of Health Physics. He is a technical advisor at Kyushu Environmental Evaluation Association (Fukuoka, Japan). Dr. Tolmachev has active collaborations with the European Radiation Dosimetry Group (EURADOS) WG-7 on Internal Dosimetry, Karlsruhe Institute of Technology (Germany), Public Health England (United Kingdom), and Radiation Protection Bureau at Health Canada (Canada), as well as with the leading U.S. research institutions such as Pacific Northwest National Laboratory, Los Alamos National Laboratory, and Radiation Emergency Assistance Center/Training Site.

Sergei Y. Tolmachev
Yoder C


Yoder C

directed Landauer's technical activities relating to radiation dosimetry, particularly for applications in radiation protection from 1983 through his retirement in 2015. Additionally, he oversaw subsidiary and partner businesses located in Australia, Brazil, China, France, Mexico, Japan, Sweden and Turkey.

An internationally known expert in radiation monitoring, Dr. Yoder led Landauer's transition from film and thermoluminescent dosimetry technology to optically stimulated luminescence, an assignment that required strategic planning and direction in areas spanning scientific research, product development, manufacturing, laboratory operations and marketing. From 1993 to 2001, he was Vice President of Operations and managed Landauer's manufacturing and analytical laboratory activities in addition to overseeing research and development programs.

Dr. Yoder is a member of NCRP and former President of the Council on Ionizing Radiation Measurements and Standards. He has served on several national and international committees to develop dosimetry standards. He was a member of a National Research Council committee that examined the accuracy of film badge measurements made during atmospheric nuclear weapons testing.

Dr. Yoder earned his MS and PhD degrees in Bionucleonics at Purdue University and received a BS in Pre-Medicine from Davidson College. He also completed the Executive Program at Stanford University. He is Certified in Comprehensive Health Physics by the American Board of Health Physics.

r. craig yoder
Zeitlin C

Cary J. Zeitlin

Zeitlin C

is a Senior Research Scientist with Leidos Innovations Corporation, working for the National Aeronautics and Space Administration (NASA) Johnson Space Center Space Radiation Analysis Group to assess exposures and risks to astronauts in current and future mission scenarios. He began his career in particle physics in the early 1980s, scanning nuclear emulsion that had been exposed to a beam of high-energy iron ions at the Lawrence Berkeley Laboratory (LBL) Bevalac. As this is one of the most tedious jobs imaginable, greener pastures soon beckoned, leading him to join the TPC/Two-Gamma Collaboration at the Stanford Linear Accelerator Center. After receiving his PhD in experimental high-energy physics and spending another 3 y at the Stanford Linear Accelerator Center as a postdoc studying the decays of the Z boson, Dr. Zeitlin returned to LBL and to nuclear physics in 1991 to work on a long-term project measuring the fragmentation cross sections most pertinent to NASA’s space radiation transport codes. This experience led to his taking over as Principal Investigator of the Martian Radiation Environment Experiment (MARIE) aboard the Mars Odyssey orbiter following the untimely passing of Dr. Gautam Badhwar. This led subsequently to his role as Co-Investigator with the Radiation Assessment Detector (RAD) project starting in 2008, as the instrument was being prepared for integration into the Curiosity Rover. After the successful transit and spectacular landing of Curiosity on Mars in 2012, RAD has been operating almost without interruption on the surface, sending back the first detailed radiation environment measurements from another planet. A second RAD was built for the International Space Station and began flight operations in early 2016. Dr. Zeitlin has received two Outstanding Performance awards from LBL and has received three awards from NASA for his work on the MARIE, RAD, and CRaTER projects. He was elected to the NCRP in 2014.

Cary J. Zeitlin

Sara Dumit

is currently a Health Physicist at Los Alamos National Laboratory (LANL) and a Lindau Nobel Laureate Meeting Alumna (2021). She earned her Ph.D. in pharmaceutical sciences from Washington State University. Her Doctoral research work was conducted at the U.S. Transuranium and Uranium Registries. Her Postdoctoral research work was completed at LANL’s Internal Dosimetry Group - Radiation Protection Division.

Her research in internal dosimetry focuses on the strategically important field of actinide biokinetics, especially where these biokinetics are affected by chelation treatment. Her areas of expertise include biokinetic model development, chelation modeling (plutonium-DTPA), and medical countermeasures after actinide intakes.

She serves as a Board Member of the European Radiation Dosimetry Group (EURADOS) ‘Working Group 7 on Internal Dosimetry’ at both Task Groups “Biokinetic Modeling of DTPA Therapy” (2016 – present) and “Internal Dosimetry in Case of Emergency” (2020 – present). She is also a Board Member of the Public Information Committee of the Health Physics Society (HPS) (2018 – present), and a Consultant for the ANSI N13.64 “Medical Management of Radiologically Contaminated Wounds” (2018 – present). She also serves as a Guest Lecturer on Internal Dosimetry at Northern New Mexico College, and as an Ad hoc reviewer for the Health Physics Journal.

Dr. Dumit has contributed numerous publications to the Radiation Protection literature and presented her research numerous times (nationally and internationally), including as invited speaker at the HPS meetings and EURADOS meetings.

Sara Dumit , PAC 7 Liaison


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Last modified: April 11, 2023