IRSN-INRS radionuclide sheet: Radiation protection: radionuclides. Thallium-201 ( irsn.fr). to find more PHYSICAL CHARACTERISTICS Thallium-201 ( 201Tl ) ▖Radioactive half-life: 3 d ▖Main types of radiation emitted: X and g Thallium-204 ( 204Tl ) ▖Radioactive half-life: 3.8 years ▖Main types of radiation emitted: bSOURCES OF EXPOSURE ▖201Tl: nuclear medicine (diagnosis) 204 Tl Thallium 201 Tl Thallium INTERNAL CONTAMINATION MEASUREMENT J Urine bioassay J Faeces bioassay J In vivo measurement Thallium EXPOSURE RISK ▖Irradiation + 201Tl ▖External contamination ++ ▖Internal contamination ++ EMERGENCY TREATMENT Prussian Blue (Iron ferrocyanide) PRESENTATION RADIOGARDASE® 500 mg capsules (SERB). DOSAGE Persons > 12 years: 1 g, 3 times a day, i.e. 3 g/d. Children (2 to 12 years): 0.5 g, 3 times a day, i.e. 1.5 g/d. Children (< 2 years): no data being available, the administration of Prussian Blue must be evaluated with respect to the risks involved. The capsules must be swallowed with a drink or with foodstuffs; food intake speeds up biliary secretion and the enterohepatic cycle. With patients who have difficulty swallowing, the capsules can be opened and their content mixed with the food or a liquid (e.g. a mannitol solution). french-nuclear-safety.fr/dosimetric-references DOSE COEFFICIENT REFERENCE Effective committed dose per becquerel incorporated, taken from the Order mentioned in Article R. 1333-24 of the Public Health Code: RADIONUCLIDE HANDBOOK • Emergency treatment of internal contamination RH 51
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