Title :
Performance of liquid scintillation counting system Quantulus for 14C measurements
Author :
Suzuki, A. ; Sakurai, H. ; Endo, K. ; Noma, M. ; Gunji, S. ; Inui, E. ; Hamano, M.
Author_Institution :
Dept. of Phys., Yamagata Univ., Japan
Abstract :
To investigate the variation of the solar activity for the long time scale, we have started the measurements of 14C in an ancient tree, synthesizing benzene from the tree rings and using the liquid scintillation counting system Quantulus. Since the accuracy of 0.2% is necessary for the measurements, we investigated the performance of the liquid scintillation counter system Quantulus. The background rate of the Quantulus was 1 cpm while the counting rate of 14C was 90 cpm for the ancient tree. The pulse height distribution of β rays from 14C was well fitted with theoretical β rays spectrum and we confirmed that the Quantulus can detect β rays until the energy as low as 7.5 keV with good efficiency
Keywords :
beta-ray detection; biological techniques; carbon; liquid scintillation detectors; pulse height analysers; radioactive dating; 14C measurements; C; Quantulus; ancient tree; background rate; benzene; liquid scintillation counting system; pulse height distribution; solar activity; Atmospheric measurements; Energy measurement; Impurities; Magnetic field measurement; Petroleum; Photomultipliers; Pulse measurements; Satellite broadcasting; Scintillation counters; Solar power generation;
Conference_Titel :
Nuclear Science Symposium, 1998. Conference Record. 1998 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-5021-9
DOI :
10.1109/NSSMIC.1998.775235
