EMERGENCY TREATMENT No treatment required due to the very short half-life of Technetium-99m (6 h). PHYSICAL CHARACTERISTICS Technetium-99m ( 99mTc ) ▖Radioactive half-life: 6 h ▖Main types of radiation emitted: e- and g SOURCES OF EXPOSURE ▖Nuclear medicine (diagnosis) 99m Tc Technetium EXPOSURE RISK ▖Irradiation + ▖External contamination + ▖Internal contamination + INTERNAL CONTAMINATION MEASUREMENT J Urine bioassay J In vivo measurement Technetium IRSN-INRS radionuclide sheet: Radiation protection: radionuclides. Technetium-99m ( irsn.fr). to find more DOSE COEFFICIENT REFERENCE Effective committed dose per becquerel incorporated, taken from the Order mentioned in Article R. 1333-24 of the Public Health Code: french-nuclear-safety.fr/dosimetric-references RADIONUCLIDE HANDBOOK • Emergency treatment of internal contamination RH 49
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