Measurements of Neutron Fluence from the Hiroshima Atomic Bomb

概要

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To estimate neutron doses from the Hiroshima atomic bomb (A-bomb), we measured residual radionuclides ^<36>Cl (half-life of 3.0 × 10^5 y) and ^<152>Eu (half-life of 13.3 y) in a tombstone near the hypocenter. Numerous samples were obtained from the surface and from inside the tombstone, and chlorine and europium were chemically isolated from them. The ratio ^<36>Cl/Cl was measured by accelerator mass spectrometry (ams) using the postaccelerator of the Munich Tandem laboratory. ^<152>Eu was determined with gamma-ray measurements in Hiroshima. The amount of isolated europium was determined by atomic absorption spectrometry. The attenuation curves from ^<36>Cl/Cl and ^<152>Eu/Eu furnished information about the neutron energy and the angular distributions near the hypocenter of the Hiroshima A-bomb.
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