[23a-F307-1~9] 2.2 Radiation physics fundamentals & applications, radiation generators, new technology

[23a-F307-9] Application of spectral determination method to beta- and gamma-ray spectra

〇Masumi Oshima¹, Jun Goto², Takehito Hayakawa³, Tadahiro Kin⁴, Katsuyuki Suzuki¹, Haifeng Shen¹, Yuichi Sano¹, Hirofumi Shinohara¹ (1.JCAC, 2.Niigata Univ., 3.QST, 4.Kyushu Univ.)

Keywords:liquid scitillation spectra, gamma-ray spectra, spectral determination method

We developed a new nuclide determination method (SDM), which utilizes a whole spectral region. We applied the SDM to beta-ray and gamma-ray spectra measured with a liquid scintillation counter, NaI and Ge detectors. In LSC measurement three samples of ³⁶Cs, ⁹⁰Sr and ¹³⁷Cs were used. In gamma-ray measurement, six gamma-ray standard sources of ¹³⁷Cs, ²²Na, ¹³³Ba, ¹³⁴Cs, ⁶⁰Co and ¹⁵²Eu were used. For the LSC spectra, the relative determination accuracy was less than 30% for ³⁶Cl and ⁹⁰Sr with concentration of 10^-2 relative to 3x10³ Bq of ¹³⁷Cs. For the gamma-ray spectra, the relative accuracy was less than 20% for other nuclides with concentration of 10^-2 relative to 10⁴ Bq of ²²Na and ⁶⁰Co.