Wang Zhonglu, Howell Rebecca M, Burgett Eric A, Kry Stephen F, Hertel Nolan E, Salehpour Mohammad
Department of Radiation Physics, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA.
Radiat Prot Dosimetry. 2010 Jun;139(4):565-73. doi: 10.1093/rpd/ncp282. Epub 2009 Dec 15.
Calibration of the response functions of a gold (Au)-indium (In) dual foil Bonner sphere extended (BSE) system was described. The response of the In and Au foil of the system was calculated using MCNPX code with different activation cross-sectional libraries: (ACTL and ENDF VI for gold and ACTL and 532DOS2 for In). To verify and correct the calculated response functions the Bonner sphere set (BSS) was irradiated using (252)Cf and (241)AmBe sources of known neutron strengths for neutrons ranging from thermal to 20 MeV, and was irradiated at the 800-MeV neutron beam of the Los Alamos Neutron Science Center. The neutron spectrum of the 800 MeV beam was determined using time-of-flight (TOF) technique. We observed that the uncertainty of activation cross section in the resonance region can result in great uncertainty in the MCNPX-calculated response functions of activation foil-based BSS. The MCNPX-calculated response functions must be corrected using neutron sources of known spectrum and strength.
描述了金（Au）-铟（In）双箔Bonner球扩展（BSE）系统响应函数的校准。使用MCNPX代码并结合不同的活化截面库（金用ACTL和ENDF VI，铟用ACTL和532DOS2）计算了该系统中铟箔和金箔的响应。为了验证和校正计算得到的响应函数，使用已知中子强度的（252）Cf和（241）AmBe源对Bonner球装置（BSS）进行辐照，中子能量范围从热中子到20 MeV，并在洛斯阿拉莫斯中子科学中心的800 MeV中子束下进行辐照。利用飞行时间（TOF）技术确定了800 MeV束流的中子能谱。我们观察到，共振区域内活化截面的不确定性会导致基于活化箔的BSS的MCNPX计算响应函数产生很大的不确定性。必须使用已知能谱和强度的中子源对MCNPX计算的响应函数进行校正。
