title: Evaluation of scattered radiation in a calibration range using exposure rate energy spectra.
abstract: ISO standard 4037 specifies that for calibrating protection level dosimeters, scattered radiation should contribute less than 5% of the exposure. In previous work, the authors reported the results of an MCNP analysis of the shadow shield technique that was performed for a calibration range with a Cs irradiator. This paper examines the energy distribution of the photons contributing to the exposure percent scatter (S%) and the detailed origin of the scatter that originates in the irradiator. In summary, it reports that: 1) the majority of S% is due to photons with energies that are significantly below the source energy, 2) a significant percentage of S% is due to photons that scatter within the source and source capsule walls, and 3) S% due to scatter within the irradiator is even more significant than previously reported.
authors: The Ohio State University, Nuclear Engineering Program, 201 W. 19th Avenue, Columbus, OH 43210, USA.
authors: Christian M
authors: CM
authors: Petrie
authors: Thomas E
authors: TE
authors: Blue
authors: Kevin
authors: K
authors: Herminghuysen
mesh_terms: D000465:Algorithms; D002138:Calibration; D002588:Cesium Radioisotopes / Q000032:analysis*; D005720:Gamma Rays; D008962:Models, Theoretical; D009010:Monte Carlo Method; D017785:Photons; D011835:Radiation Protection / Q000379:methods* / Q000592:standards; D011874:Radiometry / Q000379:methods*; D012542:Scattering, Radiation
chemical_list: D002588:Cesium Radioisotopes