Tamaru Aburai

Radioassay by an efficiency tracing technique using a liquid scintillation counter

Abstract The various nuclides other than 3H are radioaasayed with an efficiency tracing technique. It has been clarified in this study that the liquid scintillation efficiency tracing technique possesses the following advantages; (1) sample preparation is of simplicity (2) even a nuclide different from a nuclide to be measured can be used as a reference sample, and (3) many kinds of pure β- and β-γ-emitters can be effectively radioassayed with a small error. Moreover, this technique has been systematized and successfully computerized to be applicable for a routine radioassay.

Accuracy of Cerenkov measurements using a liquid scintillation spectrometer

Abstract Cerenkov counting efficiency varies with colour quenching and sample turbidity. The activity in a plastic vial can be determined accurately with a colour quenching correction technique, regardless of the presence or absence of turbidity in a sample. On the other hand, the error of the measured activity in a glass vial becomes large with increasing sample turbidity due to the dissimilarity of the quench correction curves for non-turbid and turbid samples.

Quantitative Measurement Method of α-Emitters by Using Liquid Scintillation Counter Connected with Multichannel Pulse-Height Analyzer

液体シンチレーション計数装置とマルチチャネル波高分析器の両者の利点を活用した新しいα放出体の定量法を開発した。本測定法によると, 試料調製が容易で, 100%の計数効率が得られ, さらに妨害放射線の影響を除去できるなど, 他の測定法よりすぐれたα放出体の定量が可能となる。

A CONTINUOUS SCINTILLATION COUNTER USING A PARAFFIN SCINTILLATOR AND A SOLID SUPPORT

Abstract A new scintillation counting system which allows radioactive effluent to be monitored continuously has been proposed. The effluent is immediately solidified on a glass-fiber support tape by continuously dropping small amounts of molten paraffin scintillator onto it. Since the prepared sample holds the sequence of the elution, it can be measured repeatedly and stored. The technique provides high counting efficiency, good reproducibility in measurement and no memory effect without using a counting vial. A counting efficiency of about 15% is obtainable for 3H, 85% for 14C and 95% for 32P with a specialized scintillation counter which has been constructed so as to move the solid support sample with a constant speed between two slits on which each photomultiplier tube is closely mounted.