Neutron/gamma dose separation by the multiple-ion-chamber technique

Technical Report · Sat Jan 01 04:00:00 EST 1983

DOI:https://doi.org/10.2172/5882758· OSTI ID:5882758

Goetsch, S. J.

Many mixed n/..gamma.. dosimetry systems rely on two dosimeters, one composed of a tissue-equivalent material and the other made from a non-hydrogenous material. The paired chamber technique works well in fields of neutron radiation nearly identical in spectral composition to that in which the dosimeters were calibrated. However, this technique is drastically compromised in phantom due to the degradation of the neutron spectrum. The three-dosimeter technique allows for the fall-off in neutron sensitivity of the two non-hydrogenous dosimeters. Precise and physically meaningful results were obtained with this technique with a D-T source in air and in phantom and with simultaneous D-T neutron and /sup 60/Co gamma ray irradiation in air. The MORSE-CG coupled n/..gamma.. three-dimensional Monte Carlo code was employed to calculate neutron and gamma doses in a water phantom. Gamma doses calculated in phantom with this code were generally lower than corresponding ion chamber measurements. This can be explained by the departure of irradiation conditions from ideal narrow-beam geometry. 97 references.

• Research Organization: Wisconsin Univ., Madison (USA). Dept. of Medical Physics
• DOE Contract Number: AC02-76EV01105
• OSTI ID: 5882758
• Report Number(s): DOE/EV/01105-T2; ON: DE83017507
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
COMPUTER CODES
DATA
DOSES
DOSIMETRY
EXPERIMENTAL DATA
GAMMA DOSIMETRY
INFORMATION
IONIZATION CHAMBERS
MEASURING INSTRUMENTS
MOCKUP
MONTE CARLO METHOD
NEUTRON DOSIMETRY
NEUTRON SPECTRA
NUMERICAL DATA
PHANTOMS
RADIATION DETECTORS
RADIATION DOSES
SPECTRA
STRUCTURAL MODELS