| 摘要 |
PCT No. PCT/JP91/00780 Sec. 371 Date Feb. 11, 1992 Sec. 102(e) Date Feb. 11, 1992 PCT Filed Jun. 11, 1991 PCT Pub. No. WO91/19969 PCT Pub. Date Dec. 26, 1991.A density-moisture measuring apparatus includes an NaI scintillator 4 which detects only a gamma ray from a californium 1 which has passed through an object 20, a plastic scintillator 15 for detecting the gamma ray and a fast neutron ray, and a photomultiplier 6 coupled to these scintillators. It can be said that there is a proportional relation between gamma ray data Nc and N gamma which have passed through the object 20 detected by the NaI scintillator 4 and the plastic scintillator 15. The gamma ray data and the fast neutron ray data N gamma and Nn detected by plastic scintillator 15 are not separated from each other even by a pulse-shape discrimination, but they can be separated by using a relation between gamma ray data Nc detected by the NaI scintillator 4 and the gamma ray data detected by the plastic scintillator 15. Further, since a plastic scintillator 15 is used, handling is easy. In addition, plastic scintillator detects the gamma ray and the fast neutron ray and it also serves as an optical guide of the detected light from the NaI scintillator.
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