NEW EVALUATION METHODS FOR RADIAL UNIFORMITY IN  NEUTRON TRANSMUTATION DOPING

HAKSUNG KIM; JAE-YONG LIM; CHEOL HO PYEON; TSUYOSHI MISAWA; SEIJI SHIROYA; SANG-JUN PARK; MYONG-SEOP KIM; SOO-YOUL OH; BYUNG-JIN JUN

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자료유형: 학술저널

저자정보: HAKSUNG KIM JAE-YONG LIM CHEOL HO PYEON TSUYOSHI MISAWA SEIJI SHIROYA SANG-JUN PARK MYONG-SEOP KIM SOO-YOUL OH BYUNG-JIN JUN

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제42권 제4호

발행연도: 2010.1

수록면: 442 - 449 (8page)

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Recently, the neutron irradiation for large diameter silicon (Si)-ingots of more than 8" diameter is requested to satisfy the demand for the neutron transmutation doping silicon (NTD-Si). By increasing the Si-ingot diameter, the radial non-uniformity becomes larger due to the neutron attenuation effect, which results in a limit of the feasible diameter of the Si-ingot. The current evaluation method has a certain limit to precisely evaluate the radial uniformity of Si-ingot because the current evaluation method does not consider the effect of the Si-ingot diameter on the radial uniformity. The objective of this study is to propose a new evaluation method of radial uniformity by improving the conventional evaluation approach. To precisely predict the radial uniformity of a Si-ingot with large diameter, numerical verification is conducted through comparison with the measured data and introducing the new evaluation method. A new concept of a gradient is introduced as an alternative approach of radial uniformity evaluation instead of the radial resistivity gradient (RRG) interpretation. Using the new concept of gradient, the normalized reaction rate gradient (NRG) and the surface normalized reaction rate gradient (SNRG) are described. By introducing NRG, the radial uniformity can be evaluated with one certain standard regardless of the ingot diameter and irradiation condition. Furthermore, by introducing SNRG, the uniformity on the Si-ingot surface, which is ignored by RRG and NRG, can be evaluated successfully. Finally, the radial uniformity flattening methods are installed by the stainless steel thermal neutron filter and additional Si-pipe to reduce SNRG.

#Neutron Transmutation Doping #NTD) #Radial Uniformity #Radial Resistivity Gradient #RRG) #Normalized Reaction Rate Gradient #NRG) #Partial Normalized Reaction Rate Gradient #PNRG) #Surface Normalized Reaction Rate Gradient #SNRG)

참고문헌 (14)

참고문헌 신청

A. K. Freund / 1983 / Cross-sections of materials used as neutron monochromators and filters / Nucl. Inst. Methods 213 : 495 ~

A. W. Cabonari / 1993 / An irradiation rig for neutron transmutation doping of silicon in the IEA-R1 research reactor / Nucl. Inst. Methods B 83 : 157 ~

B. J. Jun / 2000 / Analysis of NTD method in HANARO / Korean Nucl. Soc. Fall Mtg.

D. Alexiev / 1992 / Neutron transmutation doping of silicon for the production of radiation detectors / Nucl. Inst. Methods B 69 : 510 ~

H. M. Janus / 1976 / Application of thermal neutron irradiation for large scale production of homogeneous phosphorus doping of floatzone silicon / IEEE Trans. Electron Device

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