New buildup factor data for point kernel calculations
An American Nuclear Society Standards Committee Working Group, ANS-6.4.3, is developing a set of evaluated gamma-ray isotropic point-source buildup factors and attenuation coefficients for a standard reference data base. A largely unpublished set of buildup factors calculated with the moments method at the National Bureau of Standards (NBS) is being evaluated by recalculating key values with Monte Carlo, integral transport, and discrete ordinates methods. Attention is being given to frequently neglected processes such as bremsstrahlung and the effect of introducing a tissue phantom behind the shield. The proposed standard will contain data for a source energy range from 15 keV to 15 MeV and for more than 20 elements and 3 mixtures (water, air, and concrete). Though the NBS data base is comprehensive, only the results for air and water are presented here. 11 refs., 2 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA); Tokyo Inst. of Tech. (Japan). Research Lab. of Nuclear Reactor
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5317346
- Report Number(s):
- CONF-861102-3; ON: DE86012623
- Country of Publication:
- United States
- Language:
- English
Similar Records
New gamma-ray buildup factor data for point kernel calculations: ANS-6. 4. 3 standard reference data
New gamma-ray buildup factor data for point kernel calculations: ANS-6. 4. 3 standard reference data