04. 2011年10月31日 17:46:46: 3cMFnA2xr2
http://en.wikipedia.org/wiki/PlutoniumTrace amounts of plutonium were subsequently discovered in nature. ごく微量だがプルトは自然界にもあることが発見された。(核反応以外から。) Even though alpha radiation cannot penetrate the skin, ingested or inhaled plutonium does irradiate internal organs. アルファ線は皮膚をとおらないけれど、飲み込んだり吸い込んだりすると内部被曝になる(ベータ・ガンマも含めて)。 骨と肝臓に貯まる。 Plutonium is not absorbed into the body efficiently when ingested; only 0.04% of plutonium oxide is absorbed after ingestion. Plutonium absorbed by the body is excreted very slowly, with a biological half-life of 200 years.[90] Plutonium passes only slowly through cell membranes and intestinal boundaries, so absorption by ingestion and incorporation into bone structure proceeds very slowly. 飲み込んだプルトは体に吸収されにくい。0.04%が吸収され、骨・肝臓にたまる。一端体に吸収されると、体外への排出までにかなり長期間かかる。生物でいうと半減するのに200年。 Plutonium is more dangerous when inhaled than when ingested. The risk of lung cancer increases once the total radiation dose equivalent of inhaled plutonium exceeds 400 mSv. 吸い込んで肺に入り、400ミリ・シーベルトを超えると肺がんになる確率が上がる。 no human is known to have died because of inhaling or ingesting plutonium, and many people have measurable amounts of plutonium in their bodies. 人間がプルトを飲むか、吸うかで死亡したデータはない。 A commonly cited quote by Ralph Nader, states that a pound of plutonium dust spread into the atmosphere would be enough to kill 8 billion people. However, the math shows that one pound of plutonium could kill no more than 2 million people by inhalation. This makes the toxicity of plutonium roughly equivalent with that of nerve gas. プルトの殺傷力はナーヴ・ガス(神経毒ガス)と同じぐらい。1ポンドの粉プルトを吸いこめば200万人ぐらい死ぬ。巷でいわれている80億人というのは言いすぎ。 こんな感じでどうでしょう? |