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KMID : 1164219940060010056
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Journal of Korean Society for Radiotherapeutic Technology
1994 Volume.6 No. 1 p.56 ~ p.60
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Calibration of an Source Used for High Dose Rate RALS
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Abstract
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In the past, brachytherapy was carried out mostly with radium or radon sources. Currently. use of artificially produced radionuclially produced radionuclides such as is rapidly increasing. Although electrons are often used as an alternative to interstitial implants, brachytherapy continues to remain an important mode of therapy, either alone or combined with external beam. The National Council on Radiation Protection and Measurements(NCRP) recommends that the strength of any emitter should be specified directly in terms of exposure rate in air at a specified distance such as 1m. The air kerma strength is defined as the product of air kerma rate in ’free space’ and the square of the disrance of the calibration point from the source center along the perpendicular bisector, i. e., . Where is the the air kerma strength and K is the air kerma rate at a specified distance L. (usually 1m). Recommended units for all kerma strength are .
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