IN-SOIL RADIOACTIVITY DISTRIBUTION MEASURING INSTRUMENT

摘要

PROBLEM TO BE SOLVED: To examine a radioactivity distribution in a depth direction in soil in a short time.;SOLUTION: A scintillation fiber 3 is wound in a circumferential direction around the outer periphery of a sample 4 cut from soil in a cylindrical shape extending in the depth direction of a ground surface 5 at a measurement object place, to thereby form a radiation detection unit 2 where the whole shape of the scintillation fiber 3 becomes a cylindrical shape. A measurement system 6 is connected to the scintillation fiber 3, that has a function of obtaining a count value of a radiation at a depth-directional position from a ground surface corresponding to the axial direction of a cylindrical shape formed by the scintillation fiber 3 after obtaining a spatial distribution of a radiation in the longitudinal direction of the scintillation fiber 3, and a function of obtaining a radioactive distribution in a depth direction from a ground surface on the basis of the obtained count value of a radiation at a depth-directional position from the ground surface. A radioactive distribution in a depth direction from a ground surface concerning a sample 4 is obtained by the measurement system 6 in one radiation measurement operation with respect to a sample 4.;COPYRIGHT: (C)2014,JPO&INPIT