neill stanford, chp stanford dosimetry, llc · • a tld dose algorithm for mixed fields at a...
TRANSCRIPT
Presented at the 27th International Dosimetry and Records Symposium
Neill Stanford, CHPStanford Dosimetry, LLC
Panasonic neutron sensitive phosphor = Li2B4O7– responds to thermal neutrons– responds to photons and betas– has a very different photon energy response
characteristics than CaSO4
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Correction factor (response to dose) depends on the radiation type and energy.
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• What field combinations?– Known photon and known neutron– Unknown photon and known neutron– Unknown photon and unknown neutron– Unknown photon, unknown neutron, unknown
beta
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• UD-802– Uses nLi2nB4O7
– Non-photon response may include beta• UD-812
– Uses 7Li211B4O7
– Non-photon response is essentially all neutron
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• Filtration is designed for perpendicular radiation– Scattered neutrons that make it behind the
filters will confound any difference in responses
– Use a Cd fence around the badge to stop unfiltered thermal neutrons from getting to the elements
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• UD-802/UD-809 dosimeters irradiated at PNNL. Rotating phantom
• Response/dose• Albedo response is decreased• Response looks more moderated
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Ratio albedo:thermal
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Net neutron response (relative to dose) of incident thermal (E3) and albedo (E4) elements
• A TLD Dose Algorithm for Mixed Fields at a Nuclear Weapons Facility, Stanford Dosimetry, Presented at the Radiation Protection Dosimetry Conference, 1994
• Back to Basics - Algorithms (3 MB pdf)Stanford Dosimetry, Presented at 2007 Dosimetry and Records Conference
• A TLD Dose Algorithm for Mixed Fields at a Nuclear Weapons Facility, Stanford Dosimetry, Presented at the Radiation Protection Dosimetry Conference, 1994
• Back to Basics - Algorithms (3 MB pdf)Stanford Dosimetry, Presented at 2007 Dosimetry and Records Conference
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