Device for measuring positron annihilation life, method of adjusting radiation measuring instrument, and radiation measuring instrument

摘要

PROBLEM TO BE SOLVED: To perform accurate measurement by simultaneously and parallelly using a plurality of radiation detector.;SOLUTION: Time differences Δt between a pulse output P0A from a start detector 11A as well as a pulse output P0B from a start detector 11B and a pulse output P1 from a stop detector are measured to generate a histogram of Δt. The time interval between the pulse output P1 and the pulse output P0B is set to uniformly spread for a shift time T in addition to the original time interval ΔtB with respect to the pulse output P0A as the reference. In Fig. 2 (iii) which is a measured histogram of Δt, since the shift time T is uniformly added to the original time interval ΔtB, the distribution of a peak on the left corresponds to the histogram of ΔtA, and the distribution of a peak on the right side corresponds to the histogram of ΔtB. By shifting the histogram of ΔtB in the horizontal axis direction, the histogram of ΔtB is overlapped with the histogram of ΔtA.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2019,JPO&INPIT