Hamamatsu Photonics Kabushiki Kaisha

Keisuke Masueda

Hiroshi Uchida

Kiyoshi Koike

Tatsuro Hayashi

Rikushi Morita

An apparatus for measuring the density or the like of an object from the level of transmission through the object of gamma rays having different energy levels which are transmitted at the object by a gamma source having a predetermined solid angle of transmission. A collimator collimates gamma transmitted through the object and a scintillator generates light corresponding to the output of the collimator. Plural photomultipliers generate position-dependent electrical signals corresponding to the light generated by an incident gamma ray photon to the scintillator. A calculating circuit generates a density spectrum for the object from the position-dependent electrical signals by integrating the position-dependent electrical signals corresponding to each of the incident gamma ray photons to the scintillator.

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Shizuoka, Japan

Keisuke Masueda