Morita M, Shoji M, Honda T, Sakanoue M
Radioisotope Laboratory, Toyama Medical and Pharmaceutical University.
Radioisotopes. 1987 Jun;36(6):282-5. doi: 10.3769/radioisotopes.36.6_282.
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.
1986年5月7日至5月31日，在富山对切尔诺贝利反应堆事故造成的环境放射性进行了调查。通过伽马射线能谱法（高纯锗探测器；ORTEC GMX - 23195）对空气颗粒、雨水、饮用水、牛奶和艾蒿中的放射性进行测量。从空气颗粒样本中识别出10种不同的核素（103Ru、106Ru、131I、132Te - I、134Cs、136Cs、137Cs、140Ba - La）。在空气样本中，1986年5月13日观察到每种核素的最大放射性浓度。根据131I/132I和137Cs/134Cs的比率计算出反应堆关闭时间和反应堆处的热中子通量。此次事故在富山造成的照射剂量如下：内照射；[甲状腺]成人 - 59微希沃特，儿童 - 140微希沃特，婴儿 - 130微希沃特，[全身]成人 - 0.2微希沃特，儿童、婴儿 - 0.4微希沃特，外照射；7微希沃特，有效剂量当量；成人 - 9微希沃特，儿童 - 12希沃特，婴儿 - 11微希沃特。
