Leakage Radiations in a Medical Electron Accelerator Facility: X-Rays and Capture Gamma-Rays

Absorbed dose rates of photons are measured in the maze of a medical electron accelerator facility. Radiations in the maze include high energy recoiled electrons other than low energy reflected X-rays. An ionization chamber for low energy X-rays is used for measurement, and is put in a build-up cap...

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Bibliographic Details
Published in:RADIOISOTOPES 1990/03/15, Vol.39(3), pp.83-90
Main Authors: MORIKAWA, Kaneo, ISHIMATSU, Kenji
Format: Article
Language:eng ; jpn
Subjects:
build-up cap
capture gamma-ray
electron accelerator
Electrons
ionization chamber
leakage radiation
Particle Accelerators
Radiation Dosage
Radiation Protection
Radiometry - instrumentation
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Summary:Absorbed dose rates of photons are measured in the maze of a medical electron accelerator facility. Radiations in the maze include high energy recoiled electrons other than low energy reflected X-rays. An ionization chamber for low energy X-rays is used for measurement, and is put in a build-up cap thick enough to obstruct the recoiled electrons of which contribution to the chamber output comes sometimes equal to that of X-rays. Dose rates of capture gamma-rays in the maze are estimated applying the calculation of neutron dose equivalent rates reported in the preceding paper. It is proved that capture gamma-rays are dominant in the dose rates measured in the maze at 14 MV X-ray generation. The estimated absorbed dose rates of total photons including capture gamma-rays and reflected X-rays agree with the measured ones in the range from +10% to -27%.
ISSN:0033-8303
1884-4111
DOI:10.3769/radioisotopes.39.3_83