DETERMINATION OF PHOSPHORUS IN CANNABIS BY NEUTRON ACTIVATION ANALYSIS -MEASUREMENT OF 32P CERENKOV RADIATION BY LIQUID SCINTILLATION SPECTROMETER

摘要

In this paper, the resulte of investigation on the method of quantitative determination of phosphorous, which is an important constitu¬tive element of a plant, by use of activation analysis. The measurement of β-rays from 32P was effected by applying Cerenkov radiation measurement by using a liquid scintillation spectrometer.n32P is an element formed by the 31P(n,γ) 32P reaction due to thermal neutrons from a nuclear reactor, and has a half-life period of 14.3 days, so that the quantitative determination of phosphorous becomes possible by using the method reported in the previous paper after chemically separating phos¬phorous from the identical sample which has been subjected previously to simultaneous analysis of nuclear species emitting γ-rays.