Tag Archives: radiation

The radiation released by Hiroshima bone has marked human bones

On Aug. 6, 1945, the United States dropped an atomic bomb nicknamed “Little Boy” on Hiroshima, Japan, leading to a nuclear blast that instantly claimed about 45,000 lives. Now, the jawbone of one of those casualties — belonging to a person who was less than a mile from the bomb’s hypocenter — is helping researchers determine how much radiation was absorbed by the bones of the victims, a new study finds.

The amount is staggering: Analyses show that the jawbone’s radiation dose was about 9.46 grays (Gy). A Gy is the absorption of one joule of radiation energy per kilogram of matter, which in this case is bone.

read more here and the original publication in PLOS ONE here

Molecular evolution: How the building blocks of life may form in space

In a laboratory experiment that mimics astrophysical conditions, with cryogenic temperatures in an ultrahigh vacuum, scientists used an electron gun to irradiate thin sheets of ice covered in basic molecules of methane, ammonia and carbon dioxide. These simple molecules are ingredients for the building blocks of life. The experiment tested how the combination of electrons and basic matter leads to more complex biomolecule forms — and perhaps eventually to life forms.

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Read more here