Abstract

The neutron fluence measurement and evaluation technology is very important for material irradiation test. The most essential technology in this study is the neutron irradiation evaluation method using a fluence monitor. The fluence monitors were fabricated with metal wires of the purity ${\geq}$ 99.9%, whose dimensions were 0.1mm diameter, about 3 mm length, and around 150-200 ${\mu}g$ mass range. Three wire samples (Fe, Ni, Ti) were prepared for one irradiation aluminum capsule. Five capsules were irradiated in the OR5 hole of the HANARO reactor at 30 MW power for about 25 days. After irradiation tests, radiation activities were measured with the high purity germanium (HPGe) detector. The reaction rates were calculated by using the measured radiation activity data, and then neutron fluence were obtained from the reaction rates and the weighted neutron cross section with calculated neutron spectrum at the fluence monitor position.

Keywords

• Fluence monitor;
• Neutron fluence;
• SAND-II;
• HANARO

• 중성자 조사량;

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References

1. Knoll GF. Radiation Detection and measurement. 3rd ed. NewYork; John Willey and Sons, 1999.
2. 유춘성, 박종호. 노외 감시자를 이용한 압력용기 중 성자 조사량 결정. 대한방사선방어학회지 2007;32(4): 158-167.
3. 규제지침 6.3 원자로압력용기 속중성자 조사량의 계산 및 측정.
4. Weinberg AM and Wigner EP. The Physical Theory of Neutron Chain Reactors. Chicago; The University of Chicago Press, 1958:707.
5. Beckurts KH and Wirtz K. Neutron Physics. Berlin; Spriger-Verlag Berlin, 1964.
6. Kucera J, Frana J, Horak Z. Calibration of the Reactor Neutron Spectrum for The ko-NAA Standardization Using Several Approaches. Czechoslovak Journal of Physics 1999;49(S1):295-301. https://doi.org/10.1007/s10582-999-0039-y
7. Meftah B, Zidi T, Bousbia-Salah A. Neutron flux optimization in irradiation channels at NUR research reactor. Annals of Nuclear Energy 2006; 33(14-15):1164-1175. https://doi.org/10.1016/j.anucene.2006.08.003
8. ASTM E 844. Standard Guide for Sensor Set Design and Irradiation for Reactor Surveillance. E706 (IIC).