Hamamatsu Photonics Kabushiki Kaisha

Kiyoshi Koike

Rikushi Morita

Hiroshi Uchida

Tatsuro Hayashi

Hiroshi Tsuchiya

Tsuyoshi Hayakawa

Keisuke Masueda

Takuo Fujita

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.

Apparatus for measuring density or the like of an object having a small

A method and portable apparatus for measuring radiation dose and identifying a source radionuclide. Energy correction to calibrate detected charge to .gamma.-ray energy level is made through the use of naturally occurring radiation from 40K in a potassium compound KCl. One embodiment includes a portable scintillator and photomultiplier (PMT) along with an accumulation memory, an input means, a signal processing circuit, a memory and an output means. A warning function informs of an abnormality when the difference between the measured radiation data and the standard data in the device memory exceeds a predetermined value.

Radiation dose measuring method and apparatus with nuclide

Apparatus for measuring the density of vertebrae or the like, comprises gamma ray emission means for emitting gamma rays within a predetermined target area; detecting means for detecting the gamma rays passing through the target area; and rotatable positioning means between the emission means and the detecting means for supporting a subject and exposing the subject to the gamma rays in the target area at a plurality of different angles.

Apparatus for measuring density of vertebrae or the like

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Shizuoka, Japan

Kiyoshi Koike