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Calculation of fast neutron depth-dose in the ICRU standard tissue phantom and the derivation of neutron fluence-to-dose-index conversion factors

Journal Article · · Radiat. Res.; (United States)
DOI:https://doi.org/10.2307/3574964· OSTI ID:6146428
;

Detailed neutron depth-dose data are calculated throughout the ICRU (International Commission on Radiation Units and Measurements) standard tissue phantom for parallel beams of incident neutrons with energies ranging from 0.1 to 20 MeV. From these calculated data, a set of fluence-to-dose-index conversion factors, which are needed to establish the allowable limits for exposure to external neutron beams, is obtained for both absorbed dose and dose equivalent. The depth-dose calculations are carried out by a specially developed Monte Carlo code (PHANTOM) through the utilization of a set of pointwise neutron cross-sectional data processed from the ENDF/B-IV library. Results based on a previous study which includes the transport of high-energy, penetrating secondary protons and electrons are used as correction factors for the dose values calculated on the kerma concept. The results show that the transport of the secondary charged particles affects the dose-index values only slightly. The final values for the fluence-to-dose-index conversion factors are comparable to the previously accepted values based on either the slab or the cylindrical model, with discrepancies up to about 20%.

Research Organization:
Univ. of Illinois, Urbana
OSTI ID:
6146428
Journal Information:
Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 78:3; ISSN RAREA
Country of Publication:
United States
Language:
English

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Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
BARYONS
CHARGED-PARTICLE TRANSPORT
COMPUTER CALCULATIONS
COMPUTER CODES
DATA
DATA FORMS
DEPTH DOSE DISTRIBUTIONS
DOSE EQUIVALENTS
DOSIMETRY
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FAST NEUTRONS
FERMIONS
GRAPHS
HADRONS
ICRP
INFORMATION
INTERNATIONAL ORGANIZATIONS
KEV RANGE
KEV RANGE 100-1000
MEV RANGE
MEV RANGE 10-100
MOCKUP
MONTE CARLO METHOD
NEUTRON DOSIMETRY
NEUTRON FLUENCE
NEUTRONS
NUCLEONS
NUMERICAL DATA
P CODES
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIATION TRANSPORT
SPATIAL DOSE DISTRIBUTIONS
SPHERES
STRUCTURAL MODELS
THEORETICAL DATA
TISSUE-EQUIVALENT MATERIALS