Calculated thickness of tungsten alloy required for specified attenuation of gamma radiation from Cs-137
Abstract
The traditional method of evaluating and calibrating health physics instruments is to use a calibrator that consists of a single high-activity gamma radiation source with different attenuators to select the radiation level desired for testing. To have accurate radiation intensities inside the calibrator cavity, the attenuators must be designed from precise absorption calculations. This paper reports calculations made to determine the thickness of tungsten alloy metal required for specific attenuation. These calculations include the buildup contribution by secondary scattering radiation, and they are compared to values calculated with the buildup factor omitted.
- Publication:
-
Presented at the Nuclear Science Symposium
- Pub Date:
- November 1991
- Bibcode:
- 1991nusc.sympQ...5C
- Keywords:
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- Attenuation;
- Calibrating;
- Cesium 137;
- Gamma Rays;
- Medical Equipment;
- Radiation Dosage;
- Radiation Measuring Instruments;
- Thickness;
- Tungsten Alloys;
- Absorption;
- Attenuators;
- Cavities;
- Electromagnetic Scattering;
- Health Physics;
- Radiant Flux Density;
- Radiation Sources;
- Atomic and Molecular Physics