| 摘要 |
PROBLEM TO BE SOLVED: To provide aγ-ray measuring device which accurately measures only aγ-ray of an artificial radioactive substance (e.g. a nuclide related to radioactive contamination) in radioactive substances in a sample including food.SOLUTION: Aγ-ray measuring device includes at least: a specificγ-ray shielding plate shielding aγ-ray with specific energy; and aγ-ray detector such as a Geiger-Muller (GM) tube detector, a scintillation-type detector, or a Ge detector. The specificγ-ray shielding plate includes at least one shielding plate. Theγ-ray in a range of having the specific energy among allγ-rays is shielded or attenuated according to the number and/or the thickness of the shielding plates. |
