Comment on the “Zero-shift thimble ionization chamber” [Med. Phys. 37, 1161-1163 (2010)]
نویسندگان
چکیده
منابع مشابه
Thimble-Chamber Calibration on Soft X-rays
Condenser r-meter thimble chambers of various types have been calibrated against a standard free-air ionization chamber to indicate the wavelength dependance of their readings after exposure to X-rays excited by potentials ranging from 10 to 200 kilovolts. X-ray tubes with low inherent filtration are used. Calibrations are conducted for minimumfilter conditions, and the effect of added filtrati...
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When the PDD (percentage depth dose) in the megavoltage beams is measured in the water phantom using the dosimetry system, the polarity and ion recombination effects of ionization chambers with depth in water are not usually taken into consideration. The polarity and ion recombination effects may vary depending on the radiation type and spectrum, which vary with depth in water [1-4]. If those e...
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ژورنال
عنوان ژورنال: Medical Physics
سال: 2010
ISSN: 0094-2405
DOI: 10.1118/1.3431078