Detection method of radioactive beta-particles for solving impurity and solubility problems

Strontium-90 emits beta-particles and decays into yttrium-90. At this time, the beta-particles released affect a human body, and liquid scintillation counting is used to detect such beta-particles. In general, cocktail method that mixes samples and liquid scintillators is used in conventional liquid scintillator counters. In the cocktail method, the degree of miscibility or solubility between samples and scintillators, precipitation phenomena, etc. reduce the reproducibility of the experiment. A new method for measuring beta-particles after separating samples and scintillators from each other is presented. In addition, several experiments are conducted to investigate the efficiency and tendency of the new method.