- 期刊
- OpenAccess
Characterization of Cs-137 Beam for Calibration and Dosimetric Applications
並列摘要
In this work, characterization of radiation beam of 137Cs source was performed for calibration and dosimetric purposes at National institute for standards (NIS). Different thickness of lead sheets was used to attenuate the beam in order to cover all scales of radiation detectors under calibration. The air Kerma rate was measured with two ion chambers PTW 30013 and M-32002 for both direct and attenuated beam respectively. Scattering contribution and beam flatness were measured and took into consideration in the uncertainty budget calculations. Energy spectra for direct and attenuated ^(137)Cs photon beams were measured by Sodium iodide gamma spectrometer. This work shows that the used lead attenuators enabled the calibration of all ranges of air kerma rate which are needed to be covered for radiation protection dose level. Also the use of lead collimator at 15° angle reduces the scattering by 12% at two meter distance.