Impact of switching to the ICRP-74 neutron flux-to-dose equivalent rate conversion factors at the Sandia National Laboratory Building 818 Neutron Source Range.

Ward, Dann C.

关键词: ANISOTROPY;    CALIBRATION;    CONVERSION;    CORRECTIONS;    DECAY;    DOSE RATES;    DOSIMETRY;    EMISSION;    GEOMETRY;    LABORATORY BUILDINGS;    MAINTENANCE;    NEUTRON SOURCES;    NEUTRONS;    RADIATION PROTECTION;    RADIATION TRANSPORT;    RADIATIONS;    RANGE;    REPAIR;    SANDIA NATIONAL LABORATORIES;    SUPPORTS;   

DOI  :  10.2172/983697
RP-ID  :  SAND2009-1144
PID  :  OSTI ID: 983697
Others  :  TRN: US1005026

学科分类：物理（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Sandia National Laboratories (SNL) maintains a neutron calibration facility which supports the calibration, maintenance, and repair of Radiation Protection Instruments. The SNL neutron reference fields are calibrated using the following methodology: Fluence rate is initially established by calculation using the NIST traceable source emission rate (decay corrected). Correction factors for the effects of room return or scatter, and source anisotropy are then developed by using a suitable radiation transport code to model the geometry of the facility. The conventionally true neutron dose rates are then determined using the appropriate fluence-todose equivalent conversion coefficients at several reference positions. This report describes the impact on calculated neutron dose rates of switching from NCRP-38 to CRP-74 neutron flux-todose equivalent rate conversion factors. This switch is driven by recent changes to dosimetry requirements addressed in 10 CFR 835 (Occupational Radiation Protection).