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The physics and dosimetry of fast neutrons for radiotherapy. Memorandum report. [Secondary protons]

Technical Report ·
OSTI ID:7241599
; ; ;
The practical methods for generating fast-neutron beams for cancer radiotherapy are compared (DT versus D on Be). A general effort is made to compare and contrast the interactions and depth-dose patterns for gamma ray beams with those for the NRL fast-neutron beam of app. 14-MeV average energy (35-MeV D/sup +/ on Be). Typical instrumentation for dosimetry and monitoring are described, and the procedure for absolute dose calibration of non-tissue-equivalent ionization chambers is outlined, on the basis of the Bragg--Gray relation. The buildup of the dose by the secondary proton field in TE first few millimeters of tissue (which gives rise to 'skin-sparing' in radiotherapy) has been measured in TE plastic, and the compromise of skin sparing by superposition of various materials is also shown, along with restoration of skin sparing by interposing lead foils to filter out the recoil protons. Narrow-broad-beam attenuation coefficients for /sup 60/Co gamma rays vs the NRL neutron beam are shown for a variety of materials, and some semi-broad-beam data for Benelex (pressed wood), Pb, and Fe are also included. (auth)
Research Organization:
Naval Research Lab., Washington, D.C. (USA)
OSTI ID:
7241599
Report Number(s):
AD-A-019120; NRL-MR-3123
Country of Publication:
United States
Language:
English

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440102 -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ATTENUATION
BARYONS
BEAM PRODUCTION
BEAMS
BERYLLIUM 9 TARGET
BUILDUP
CALIBRATION
CHARGED-PARTICLE REACTIONS
DEPTH DOSE DISTRIBUTIONS
DEUTERON REACTIONS
DISEASES
DOSEMETERS
DOSIMETRY
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FAST NEUTRONS
FERMIONS
GAMMA DOSIMETRY
GAMMA RADIATION
HADRONS
IONIZATION CHAMBERS
IONIZING RADIATIONS
IRON
LEAD
MEASURING INSTRUMENTS
MEDICINE
METALS
MEV RANGE
MEV RANGE 10-100
NEOPLASMS
NEUTRAL-PARTICLE TRANSPORT
NEUTRON BEAMS
NEUTRON DOSIMETRY
NEUTRON TRANSPORT
NEUTRONS
NUCLEAR MEDICINE
NUCLEAR REACTIONS
NUCLEON BEAMS
NUCLEONS
PARTICLE BEAMS
PHOTON TRANSPORT
PROTONS
RADIATION DETECTORS
RADIATION DOSE DISTRIBUTIONS
RADIATION TRANSPORT
RADIATIONS
RADIOLOGY
RADIOTHERAPY
RECOILS
SPATIAL DOSE DISTRIBUTIONS
TARGETS
THERAPY
TRANSITION ELEMENTS
TRITIUM TARGET
WOOD