Journal of Radiation Protection and Research

The Korean Association for Radiation Protection (대한방사선방어학회)
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The Development Study of A Manganese Sulphate Bath System

$MnSO_4$용액조 장치 개발 연구

  • Hwang, Sun-Tae (Radiation Standards Laboratory, Korea tandards Research Institute) ;
  • Lee, Kyung-Ju (Radiation Standards Laboratory, Korea tandards Research Institute) ;
  • Choi, Kil-Oung (Radiation Standards Laboratory, Korea tandards Research Institute) ;
  • Kim, Won-Sik (Radiation Standards Laboratory, Korea tandards Research Institute)
  • 황선태 (한국표준연구소 방사선표준연구실) ;
  • 이경주 (한국표준연구소 방사선표준연구실) ;
  • 최길웅 (한국표준연구소 방사선표준연구실) ;
  • 김원식 (한국표준연구소 방사선표준연구실)
  • Published : 1986.06.20
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Abstract

In order to establish the national standards of neutron measurements, a manganese sulphate ($MnSO_4$) bath system was developed under the IAEA technical support. This bath system was made up of a spherical s.s. 316 L bath, of 3.5 mm thick and of 125 cm internal diagmeter, filled with a manganese sulphate solution, a solution circulating system, and a $^5Mn\;{\gamma}-ray$ monitoring system. The solution pumped from the bath was introduced into a Marinelli beaker-type monitor vessel which was equipped with two seperate detectors, $3.8cm{\phi}{\times}3.8cm$ NaI(T1) crystals. The performance of the system were tested using the neutron sources, $^{241}Am-Be\;and\;^{252}Cf$, mounted at the center of the bath. From the decay curve analysis of $^{56}Mn$ activity, neutron emission rate of $^{252}Cf$ by the comparative method was obtained to be $3.71{\times}10^7\;n/s\;per\;50{mu}g$ as of November 15, 1985.

중성자 측정의 국가표준을 확립하기 위하여 국제원자력거주(IAEA)로 부터 기술지원을 받아서 $MnSO_4$용액조장치를 개발하였다. 본 용액조장치는 구형의 s.s. 316L $MnSO_4$용액조(두께 3.5mm, 내경 125cm), 용액의 순환계 및 5$^{56}Mn\;{\gamma}$-선 검출계동으로 구성되어 있다 .용액조 본체로부터 퍼내어진 용액은 2개의 $3.8cm{\phi}{\times}3.8cm$ NaI(T1) 검출기가 설치된 Marinelli 비이커형의 모니터 용기로 진입되어 순환된다. 본 장치의 성능검사는 $^{241}Am-Be$ 과 $^{252}Cf$ 중성자 선원 을 사용하여 수행하였다. $^{56}Mn$ 방사능의 붕괴 곡선을 분석한 결과, $^{252}Cf$의 중성자 방출율은 1985년 11월 15일 현재 $3.71{\times}10^7\;n/s\;per\;50{mu}g$ 으로 얻어졌다.

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