Angular dependence of the components of dose to the bone marrow and abdomen in a human phantom from 2.95-MeV neutrons
Journal Article
·
· Health Phys., v. 25, no. 6, pp. 545-557
Gamma and recoil-ion dose measurements were carried out in a human- shaped phantom exposed to whole-body monoenergetic neutrons at 2.95 MeV. For the gamma component miniature, energycompensated, thermoluminescent dosimeters of CaF/sub 2/: Dy were used inside bones to measure the bone-marrow dose. For abdominal dose and surface dose, a small Geiger chamber was used to supplement the TL system. Proportional counters were used for the recoil-ion measurements. The dose components were measured as a function of both the angle of phantom rotation and the angle of elevation of the incident radiation. The significance of the gamma component of the fast-neutron dose is discussed, and it is shown to be of particular importance with respect to incident neutron energies of 3 MeV and below, to off-normal angles of irradiation, and to the low values of the quality factors required for acute effects of radiation dose. Internal recoil- ion dose may be predicted within a factor of two from calculations. The study shows the very large effect due to the angle of incidence of the neutron radiation, and it suggests that the chest is an unsuitable badge location for practical accident dosimetry. (auth)
- Research Organization:
- Defense Research Establishment, Ottawa
- NSA Number:
- NSA-29-017469
- OSTI ID:
- 4329271
- Journal Information:
- Health Phys., v. 25, no. 6, pp. 545-557, Journal Name: Health Phys., v. 25, no. 6, pp. 545-557; ISSN HLTPA
- Country of Publication:
- United Kingdom
- Language:
- English
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Related Subjects
*ABDOMEN-- DEPTH DOSE DISTRIBUTIONS
*BONE MARROW-- DEPTH DOSE DISTRIBUTIONS
*FAST NEUTRONS-- DEPTH DOSE DISTRIBUTIONS
ACUTE IRRADIATION
ANGULAR DISTRIBUTION
BIOLOGICAL RADIATION EFFECTS
CHEST
GAMMA DETECTION
GAMMA DOSIMETRY
GAMMA RADIATION
GEIGER-MUELLER COUNTERS
IONS
MAN
MEV RANGE 01-10
N72100* --Physics (Radiation & Shielding)--Radiation Physics
NEUTRON BEAMS
PHANTOMS
PHOTOGRAPHIC FILM DOSEMETERS
PROPORTIONAL COUNTERS
QUALITY FACTOR
RADIATION ACCIDENTS
RADIATION DOSES
RECOILS
ROTATION
SKELETON
SURFACES
THERMOLUMINESCENT DOSEMETERS
*BONE MARROW-- DEPTH DOSE DISTRIBUTIONS
*FAST NEUTRONS-- DEPTH DOSE DISTRIBUTIONS
ACUTE IRRADIATION
ANGULAR DISTRIBUTION
BIOLOGICAL RADIATION EFFECTS
CHEST
GAMMA DETECTION
GAMMA DOSIMETRY
GAMMA RADIATION
GEIGER-MUELLER COUNTERS
IONS
MAN
MEV RANGE 01-10
N72100* --Physics (Radiation & Shielding)--Radiation Physics
NEUTRON BEAMS
PHANTOMS
PHOTOGRAPHIC FILM DOSEMETERS
PROPORTIONAL COUNTERS
QUALITY FACTOR
RADIATION ACCIDENTS
RADIATION DOSES
RECOILS
ROTATION
SKELETON
SURFACES
THERMOLUMINESCENT DOSEMETERS