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(I) Sickness and death due to initial radiation
The main components of initial radiation emitted in the air within 1 minute of the explosion were gamma rays and neutrons.
Man is exposed to approximately 0.1 rad of natural radiation per person per year. It is said that 50% of persons die who have received a whole body dose of 400 rad, which is known as semi-lethal dose, and that those exposed to whole body radiation of, 700 rad or more can hardly escape deiith. For the purpose of radiological protection, the International Committee on Radiological Protection (ICRP) stipulates the permissible dose for man in general as 0.5 rad per year to the whole body, gonads, or bone marrow.
The location that was exposed to the lethal dose of 700 rad was a point approximately 925 meters away from the hypocenter; and to the semi-lethal dose of 400 rad, approximately I ,025 meters. Anyone exposed without shield-ing within this distance is said to have been seriously affected by the initial radiation, and approximately 20% of deaths are said to be attributed to these effects. The location that was exposed to the permissible dose for human beings (0.5 rad) was determined to be a point approximately 2.3 kilometers away from the hypocenter.
จาก
http://www.sansepolcroliceo.it/Cincilla/Opuscono_Hiroshima/Immediate_Effects_of_Radiation%20.htm
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12 มี.ค. 54 18:33:23
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รายงานสด [แผ่นดินไหว-โรงไฟฟ้า] มีรายงานเสียงการระเบิด (reuter) (ต่อ){แตกประเด็นจาก X10333690}
