Gamma-ray dose at shield-tissue interfaces and buildup factor implications

Conference · Fri Jan 01 00:00:00 EST 1982

OSTI ID:5261486

Trubey, D K; Gopinath, D V; Subbaiah, K V

Buildup factors continue to be widely used for gamma-ray shield design, but there are several problems in application. Shure has pointed out the need for buildup factors to be consistent with the ANSI standard flux-to-dose factors. However, consistent buildup factor data cannot be obtained by simply integrating the ANSI response function over infinite-medium spectra, because this function gives the response at various depths in a tissue phantom for a gamma ray of a certain energy entering the phantom. The ANSI response function can only be applied to a spectrum emerging from a shield as determined from a transport calculation. In order to evaluate the dose in tissue from gamma rays which have penetrated a shield, a detailed transport study was undertaken at the Safety Research Laboratory at Kalpakkam in collaboration with the Radiation shielding Information Center. Computations were made using the one-dimensional transport code ASFIT which has recently been extended to treat the secondary sources of fluorescence and bremsstrahlung. Results are reported. (WHK)

• Research Organization: Oak Ridge National Lab., TN (USA); Reactor Research Centre, Kalpakkam (India). Safety Research Lab.
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5261486
• Report Number(s): CONF-820609-54; ON: DE82017499; TRN: 82-017258
• Resource Relation: Conference: American Nuclear Society annual meeting, Los Angeles, CA, USA, 6 Jun 1982
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
GAMMA RADIATION
BUILDUP
LEAD
TISSUE-EQUIVALENT MATERIALS
INTERFACES
RADIATION DOSES
SHIELDING
TISSUES
BODY
DOSES
ELECTROMAGNETIC RADIATION
ELEMENTS
IONIZING RADIATIONS
MATERIALS
METALS
RADIATIONS
655003* - Medical Physics- Dosimetry
654002 - Radiation & Shielding Physics- Shielding Calculations & Experiments- (-1987)