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.
journal_name
Health Physjournal_title
Health physicsauthors
Petrie CM,Blue TE,Herminghuysen Kdoi
10.1097/HP.0b013e3182259a98subject
Has Abstractpub_date
2012-01-01 00:00:00pages
71-80issue
1eissn
0017-9078issn
1538-5159pii
00004032-201201000-00008journal_volume
102pub_type
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