https://www.fda.gov/regulatory-information/search-fda-guidance-documents/radiation-biodosimetry-medical-countermeasure-devices
Radiation Biodosimetry Medical Countermeasure Devices | FDA
Applies to premarket submissions for medical device systems intended to measure biological responses to unintended (non-therapeutic) radiation absorption.
medical countermeasureradiationbiodosimetrydevicesfda
https://www.nist.gov/publications/individual-biodosimetry-natural-radiation-background-level
Individual Biodosimetry at the Natural Radiation Background Level | NIST
at thenatural radiationbackground levelindividualbiodosimetry