[Influence of nuclear reactor accident at Chernobyl' on the environmental radioactivity in Toyama].
The environmental radioactivity caused by the reactor accident at Chernobyl' was investigated from May 7 to May 31 of 1986 in Toyama. Measurement of radioactivities in airborne particles, rain water, drinking water, milk, and mugwort are carried out by gamma-ray spectrometry (pure Ge detector; ORTEC GMX-23195). Ten different nuclides (103Ru, 106Ru, 131I, 132Te-I, 134Cs, 136Cs, 137Cs, 140Ba-La) are identified from samples of airborne particles. In the air samples, a maximum radioactivity concentration of each nuclide is observed on 13th May 1986. The time of the reactor shut-down and the flux of thermal neutron at the reactor were calculated from 131I/132I and 137Cs/134Cs ratio. The exposure dose in Toyama by this accident is given as follows: internal exposure; [thyroid] adult-59 microSv, child-140 microSv, baby-130 microSv, [total body] adult-0.2 microSv, child, baby-0.4 microSv, external exposure; 7 microSv, effective dose equivalent; adult-9 microSv, child-12 Sv, baby-11 microSv.
Morita
M
M
Radioisotope Laboratory, Toyama Medical and Pharmaceutical University.
Shoji
M
M
Honda
T
T
Sakanoue
M
M
D000059:Accidents; D000396:Air Pollutants, Radioactive / Q000032:analysis; D004781:Environmental Exposure; D007564:Japan; D009688:Nuclear Reactors; D011829:Radiation Dosage; D011847:Radioactive Fallout / Q000032:analysis*; D014455:Ukraine; D014878:Water Pollution, Radioactive / Q000032:analysis
D000396:Air Pollutants, Radioactive; D011847:Radioactive Fallout