| 摘要 |
<p>A density-moisture measuring system includes: a NaI scintillator (4) for detecting only a η-ray from a californium (1) which has passed through an article (20) to be measured; a plastic scintillator (15) for detecting a η-ray and a neutron beam; and a photomultiplier tube (6) connected to the said scintillators. A proportional relationship seems to be established between η-ray data Nc and Nη which have passed through the article (20) and have been detected by the NaI scintillator (4) and the plastic scintillator (15). The η-ray data and fast neutron beam data Nη, Nn which have been detected by the plastic scintillator (15) cannot be separated even by use of wave form discrimination, but, can be separated by use of the relationship between the η-ray data Nc detected by the NaI scintillator (4) and the η-ray data detected by the plastic scintillator (15). Further, the use of the plastic scintillator (15) makes it easy to handle. Furthermore, the plastic scintillator carries out the detection of the η-ray and the fast neutron beam and functions as an optical guide for a ray of light detected by the NaI scintillator for detecting the η-ray.</p> |
