Fast neutron depth dose distributions in a heterogeneous phantom

Technical Report · Mon May 01 04:00:00 EDT 1978

OSTI ID:5406098

Shonka, J J

A Monte Carlo code has been developed which can be used to calculate parameters of interest in the Reference Man series of phantoms. The code has been employed in calculations simulating the Rijswijk pre-clinical neutron therapy studies. Results obtained from the code for an A-P exposure of the left lung included the adsorbed dose to various organs and the depth dose distribution, neutron spectra, and LET spectra. The neutron transport was taken from GTC and the gamma transport came from ALGAM. Cross sections used in the code were obtained from the GTC cross section library and the ENDF/BIV library. The Reference Man series of phantoms is derived from data in the recently published Reference Man report. Comparisons have been made with published results from Rijswijk as well as those of McGinley. Experimental measurements were made for four cases: a homogeneous soft tissue phantom and heterogeneous phantoms with soft tissue and lung, soft tissue and skeleton, and soft tissue with lung and skeleton, respectively. These measurements were made in a physical mockup of the Reference Man phantom using Lucite organs filled with equivalent substitutes for skeleton, lung, and soft tissue. These measurements used a small tissue-equivalent proportional counter, a tissue-equivalent ionization chamber, and an energy compensated G-M tube. From all techniques, total dose, LET, fast neutron dose and gamma dose were derived as a function of depth in the thoracic region. 73 refs., 23 figs., 10 tabs. (DT)

• Research Organization: Oak Ridge Associated Universities, Inc., TN (USA); Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-76OR00033; AC05-84OR21400
• OSTI ID: 5406098
• Report Number(s): DOE/OR/00033-T153; ON: DE85015019
• Country of Publication: United States
• Language: English

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560151* -- Radiation Effects on Animals-- Man
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BODY
COMPUTER CALCULATIONS
DEPTH DOSE DISTRIBUTIONS
DOSES
DOSIMETRY
ENERGY TRANSFER
KERMA
LET
LUNGS
MEDICINE
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MONTE CARLO METHOD
NEUTRON DOSIMETRY
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PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIATION DOSES
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RADIOTHERAPY
RESPIRATORY SYSTEM
SKELETON
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
THERAPY