french-nuclear-safety.fr/dosimetric-references EMERGENCY TREATMENT At present there is no effective antidote for contamination by this radionuclide. PHYSICAL CHARACTERISTICS Neptunium-237 ( 237Np ) ▖Radioactive half-life: 2.1•106 years ▖Main types of radiation emitted: a, X and g (very low levels) SOURCES OF EXPOSURE ▖By-products from nuclear reactors and plutonium production ▖Used as a component for neutron detectors 237 Np Neptunium EXPOSURE RISK ▖Irradiation 0 ▖External contamination 0 ▖Internal contamination +++ INTERNAL CONTAMINATION MEASUREMENT J Urine bioassay J Faeces bioassay Neptunium 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 33
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