10. 2011年5月14日 21:49:13: EGaQ73B5yp
下記の解説によれば１０〜５０シーベルトの高線量の被曝だと、即死するそうです。
ニューヨーク・タイムズ（http://www.nytimes.com/2011/03/16/world/asia/16workers.html?_r=3&pagewanted=all）
の、「胸を押さえて突然倒れた作業員」や、今回の変死した作業員は、高線量被曝で
即死した可能性が否めません。
ーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーー
http://www.atomicarchive.com/Effects/effects15.shtml
Radiation Effects on Humans Certain body parts are more specifically affected by exposure to different types of radiation sources. Several factors are involved in determining the potential health effects of exposure to radiation. These include: * The size of the dose (amount of energy deposited in the body)
* The ability of the radiation to harm human tissue
* Which organs are affected The most important factor is the amount of the dose - the amount of energy actually deposited in your body. The more energy absorbed by cells, the greater the biological damage. Health physicists refer to the amount of energy absorbed by the body as the radiation dose. The absorbed dose, the amount of energy absorbed per gram of body tissue, is usually measured in units called rads. Another unit of radation is the rem, or roentgen equivalent in man. To convert rads to rems, the number of rads is multiplied by a number that reflects the potential for damage caused by a type of radiation. For beta, gamma and X-ray radiation, this number is generally one. For some neutrons, protons, or alpha particles, the number is twenty. Hair： The losing of hair quickly and in clumps occurs with radiation exposure at 200 rems or higher. Brain： Since brain cells do not reproduce, they won't be damaged directly unless the exposure is 5,000 rems or greater. Like the heart, radiation kills nerve cells and small blood vessels, and can cause seizures and immediate death. Thyroid： The certain body parts are more specifically affected by exposure to different types of radiation sources. The thyroid gland is susceptible to radioactive iodine. In sufficient amounts, radioactive iodine can destroy all or part of the thyroid. By taking potassium iodide can reduce the effects of exposure. Blood System： When a person is exposed to around 100 rems, the blood's lymphocyte cell count will be reduced, leaving the victim more susceptible to infection. This is often refered to as mild radiation sickness. Early symptoms of radiation sickness mimic those of flu and may go unnoticed unless a blood count is done.According to data from Hiroshima and Nagaski, show that symptoms may persist for up to 10 years and may also have an increased long-term risk for leukemia and lymphoma. For more information, visit Radiation Effects Research Foundation. Heart： Intense exposure to radioactive material at 1,000 to 5,000 rems would do immediate damage to small blood vessels and probably cause heart failure and death directly. Gastrointestinal Tract： Radiation damage to the intestinal tract lining will cause nausea, bloody vomiting and diarrhea. This is occurs when the victim's exposure is 200 rems or more. The radiation will begin to destroy the cells in the body that divide rapidly. These including blood, GI tract, reproductive and hair cells, and harms their DNA and RNA of surviving cells. Reproductive Tract： Because reproductive tract cells divide rapidly, these areas of the body can be damaged at rem levels as low as 200. Long-term, some radiation sickness victims will become sterile. ------------------------------------------------------
Dose-rem Effects
------------------------------------------------------
5-20 Possible late effects; possible chromosomal damage.
20-100 Temporary reduction in white blood cells.
100-200 Mild radiation sickness within a few hours: vomiting, diarrhea, fatigue; reduction in resistance to infection.
200-300 Serious radiation sickness effects as in 100-200 rem and hemorrhage; exposure is a Lethal Dose to 10-35% of the population after 30 days (LD 10-35/30).
300-400 Serious radiation sickness; also marrow and intestine destruction; LD 50-70/30.
400-1000 Acute illness, early death; LD 60-95/30.
1000-5000 Acute illness, early death in days; LD 100/10.
ーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーー ↑
１レム＝0.01シーベルト（つまり上記の数字を100分の１にすればシーベルト単位になる）
------------------------------------------------------------------
http://ja.wikipedia.org/wiki/%E3%83%AC%E3%83%A0 レム (REM, rem) は、線量当量（生物体における放射性粒子の吸収線量）の単位である。REMは「roentgen equivalent in man and mammal」の略である。 吸収線量1ラド (rad) のX線の線量当量が1レムと定義される。それ以外の放射線は、放射線の種類ごとに定められた生物学的効果比率 (RBE) を線量当量に乗じて得る。（つまり言い換えれば、X線のRBEは 1 rem/rad である） レントゲン(R)単位で計測した照射線量に、放射線の種類ごとの生物学的影響の程度を表す係数を乗じても求められる。重みづけ系数rW=1としたとき、1レムは1.07185レントゲンとなる。 ラドはMKS単位ではない（CGS単位でもない）ので、ラドもレムも国際単位系(SI)には導入されていない。SIにおける線量当量の単位はシーベルト(Sv)であり、1シーベルトは100レムである。 レムは日常の放射線を表すには大きすぎるので、その1000分の1のミリレム(mrem)も広く使われていた。ただし、シーベルトはもっと大きい。 ------------------------------------------------------------------
|
スパムメールの中から見つけ出すためにメールのタイトルには必ず「阿修羅さんへ」と記述してください。