Journal of Radiation Protection and Research

The Korean Association for Radiation Protection (대한방사선방어학회)
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Absolute $^{56}Mn$ Activity Measurement by $4{\pi}{\beta}-{\gamma}$ Conincidence Counting Technique

$4{\pi}{\beta}-{\gamma}$ 동시계수기술에 의한 $^{56}Mn$방사능 절대측정

  • Hwang, Sun-Tae (Radiation Laboratory, Korea Standards Research Institute) ;
  • Choi, Kil-Oung (Radiation Laboratory, Korea Standards Research Institute) ;
  • Oh, Pil-Jae (Radiation Laboratory, Korea Standards Research Institute) ;
  • Lee, Kyung-Ju (Radiation Laboratory, Korea Standards Research Institute) ;
  • Lee, Kun-Jai (Department of Nuclear Engineering Korea Advanced Institute of Science and Technology)
  • 황선태 (한국표준연구소.방사선연구실) ;
  • 최길웅 (한국표준연구소.방사선연구실) ;
  • 오필제 (한국표준연구소.방사선연구실) ;
  • 이경주 (한국표준연구소.방사선연구실) ;
  • 이건재 (한국과학기술원.핵공학과)
  • Published : 1987.12.15
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Abstract

In order to determine the $^{56}Mn\;{\gamma}$-detection efficiency of a $MnSO_4$ bath system, it is essential to do the absolute activity measurement of $^{56}Mn$ solution. For the fabrication of $^{56}Mn$ samples, a 13.718 mg of $^{56}Mn$ metal flake with 99.99% purity was irradiated for 12 minutes at the thermal neutron field of about $10^{13}n/cm^2s$ of flux density. The neutron activated $^{56}Mn$ metal sample was dissolved in 50 ml of 0.1 N-HCl solution. The $^{56}Mn$ samples were fabricated by using the dissolved stock solution and the activity of each of them was measured by the $4{\pi}{\beta}-{\gamma}$ coincidence counting technique. The obtained result was 408.070 kBq/mg with total uncertainty of 0.366% at reference date, 0 h on October 15, 1987.

황산망간 용액조장치의 $^{56}Mn\;{\gamma}$선 검출효율을 결정하는데 $^{56}Mn$용액의 방사능을 절대측정하는 것은 필수적이다 $^{56}Mn$시료를 제작하기 위하여 99.99%의 순도를 갖는 Mn금속조각 13.718mg되는 시료를 한국에너지연구소 TRIGA MARK-II 원자로의 중성자선속이 약 $10^{13}n/cm^2{\cdot}s$되는 열중성자장에서 12분간 조사시켰다. 중성자 방사화된 $^{56}Mn$금속시료를 0.1N-HCI 용액 50ml 용해시켜서 $^{56}Mn$시료를 제작하여 $4{\pi}{\beta}-{\gamma}$ 동시계수기술로 방사능을 측정한 결과 불확도 0.366%를 갖는 값으로서 1987년 10월 15일 0 시를 기준하여 408.070kBq/mg을 얻었다.

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