Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
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Development of Neutron Induced Prompt γ-ray Spectroscopy System Using 252Cf

252Cf 선원을 이용한 즉발감마선 계측시스템 구성

  • Park, Yong-Joon (Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute) ;
  • Song, Byung-Chul (Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute) ;
  • Jee, Kwang-Yong (Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute)
  • 박용준 (한국원자력연구소 원자력화학연구팀) ;
  • 송병철 (한국원자력연구소 원자력화학연구팀) ;
  • 지광용 (한국원자력연구소 원자력화학연구팀)
  • Received : 2002.10.16
  • Accepted : 2003.01.14
  • Published : 2003.02.25
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Abstract

For the design and set-up of neutron induced prompt ${\gamma}$-ray spectroscopy system using $^{252}Cf$ neutron source, the effects of shielding and moderator materials have been examined. The $^{252}Cf$ source being used for TLD badge calibration in Korea Atomic Energy Research Institute was utilized for this preliminary experiment. The ${\gamma}$-ray background and prompt ${\gamma}$-ray spectrum of the sample containing Cl were measured using HPGe (GMX 60% relative efficiency) located at the inside of the system connected to notebook PC at the outside of the system (about 20 meter distance). The background activities of neutron and ${\gamma}$-rays were measured with neutron survey meter as well as ${\gamma}$-ray survey meters, respectively and the system was designed to minimize the activities. Prompt ${\gamma}$-ray spectrum was measured using ${\gamma}$-${\gamma}$ coincident system for reduce the background and the continuum spectrum. The optimum system was designed and set up using the experimental data obtained.

$^{252}Cf$ 중성자 선원을 이용한 즉발감마선 계측 시스템 (NIPS, Neutron Induced Promp ${\gamma}$-ray Spectroscopy)을 설계 및 구성하기 위하여, 시스템내의 감속제 및 차폐체등의 효과를 시험하고 감마선 바탕값과 Cl을 포함한 시료의 즉발 감마선을 계측하였다. 이를 위한 예비시험으로 한국원자력연구소 내에 있는 TLD 판독용 $^{252}Cf$ 선원을 이용하였으며 즉발감마선은 시스템 내부의 동축형 HPGe (GMX, 60% relative efficiency)과 시스템외부 (약 20m 거리)의 Notebook PC 중성자와 감마선의 바탕값을 측정하고, 바탕값을 최소로 할 수 있는 차폐체의 기하학적 구조를 고안하였다. 감마선 바탕값을 최소화하기 위하여 두 개의 HPGe 검출기를 이용한 감마-감마 동시계측법을 이용하였다. 이 실험 자료를 이용하여 최적의 NIPS 시스템을 구성하였다.

Keywords

Acknowledgement

Supported by : 과학기술부

References

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