An Internal Standard Method in αSpectrometric Determination of Uranium and Thorium Radioisotopes Using Instrumental Neutron Activation Analysis

摘要

A new approach to α spectrometric determination of the radioisotopes of uranium and thorium was developed for environmental samples based on ~238U and ~232Th as internal standards. ~238U and ~232Th were accurately de- termined in the sample by simultaneous instrumental neutron activation analysis. Other aliquots of the sample were totally dissolved, uranium and thorium separated by anion exchange, and thin sources electroplated for α spectrometry.