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  1. 1. Damage of Radiation s1180194 Masato Harada タイトル
  2. 2. REM● REM is old unit which repsent amount of dose equivalent.● REM is short for roentgen equivalent in man and mammal● Sievert instead of Rem is used in the world, now.● The total dose of rems determines how much harm a person suffers.
  3. 3. Effects of Radiation● 25 rems causes some detectable changes in blood, But it does not immediately effect negative impact on the person.● Above 100 rems cause change in body.For example, the symptom is nausea ,vomiting and headache.● 300 rems or more cause temporary hair loss and damage to nerve cells and the cells that line the digestive tract. As aresult,leukemia is taken ill and power of resistance goes down.● 800 rems or more causes fatal damage.● If physical does not changes suddenly, effect by radiation may occur several tens years later.
  4. 4. Hiroshima and Nagasaki● Many people at Hiroshima and Nagasaki died not directly from the actual explosion, but from the radiation.● Wound were found on their bodies. But, they died suddenly.● They suffered from cancer, leukosis and cataract.● Especially, many survivors from atomic bomb got leukosis within a few months of the nuclear explosions● In those days, doctors and scientists didn`t understand not only method of treatment, but also cause of their death.
  5. 5. Three Mile Island● The Three Mile Island accident occurred in 1979.● The cause of the accident is cooling device trouble and operational error.● Radiation which leaked outside was little and quickly dispersed● It is said that nobody exposured to severe radioactivity.● But, extraordinary event such as fall of infant mortality is reported.
  6. 6. Chernobyl● The Chernobyl disaster was the worst nuclear accident that occurred in the world in 1986 .● The estimated total number of deaths will be 16,000. But, nobody could not know the total number of deaths.● Radioactivity of 400 times of an A-bomb dropped in Hiroshima was released.● It is sad that the cause that damage was extended was resp onse of Soviet Government and lack of safety measure.
  7. 7. Medical Treatment● Effect of living thing including human by radiation is completely maken clear medically.● If people are exposed to same amount of radioactivity, the damage that each person receives may be different.● There is not effective treatment for person who are exposed to fatal amount of radioactivity.● Experts make a study of treatment for exposure to radioactivity.● Treatment for leukosis have source in exposure to radioactivity is bone marrow transplantation.
  8. 8. Matters to be attended to● If physical does not changes suddenly, effect by radiation may occur several tens years later.● After nuclear explosion, many people contracted leukosis in Hroshima and Nagasaki.● The Chernobyl disaster great influenced on human and other living.● There is not effective treatment for person who are exposed to fatal radioactivity.