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发帖数: 382 | 1 这玩意在医院里用来给Gamma源校正用，搞不好泄漏出来的事故也是有的。
From Wiki
Caesium-137 reacts with water producing a water-soluble compound (caesium
hydroxide), and the biological behavior of caesium is similar to that of
potassium and rubidium. After entering the body, caesium gets more or less
uniformly distributed throughout the body, with higher concentration in
muscle tissues and lower in bones. The biological half-life of caesium is
rather short at about 70 days.[7] Experiments with dogs showed that a single
dose of 3800 μCi/kg (approx. 44 μg/kg of caesium-137) is lethal within
three weeks.[8]
Accidental ingestion of caesium-137 can be treated with Prussian blue, which
binds to it chemically and then speeds its expulsion from the body.[9]
The improper handling of caesium-137 gamma ray sources can lead to release
of this radio-isotope and radiation injuries. Perhaps the best-known case is
the Goiânia accident, in which an improperly-disposed-of radiation
therapy system from an abandoned clinic in the city of Goiânia, Brazil,
was scavenged from a junkyard, and the glowing caesium salt sold to curious
, uneducated buyers. This led to multiple serious injuries and cases of
death from radiation exposure.
Caesium gamma-ray sources that have been encased in metallic housings can be
mixed-in with scrap metal on its way to smelters, resulting in production
of steel contaminated with radioactivity.[10]
One notable example was the Acerinox accident of 1998, when the Spanish
recycling company Acerinox accidentally melted down a mass of radioactive
caesium-137 that came from a gamma-ray generator.[11]
In 2009, a Chinese cement company in China (the Shaanxi Province) was
demolishing an old, unused cement plant and it did not follow the standards
for handling radioactive materials. This caused some caesium-137 from a
measuring instrument to be melted down along with eight truckloads scrap
metal on its way to a steel mill. Hence, the radioactive caesium was melted
down into the steel.[12] |
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