A calibration transmission method to determine the gamma-ray linear attenuation coefficient without a collimator. (August 2015)

• Record Type: Journal Article
• Authors: Byun, Jong-In; Yun, Ju-Yong
• Is Part Of: Applied radiation and isotopes. Volume 102(2015:Aug.)
• Page Start: 70
• Page End: 73
• Publication Date: 2015-08
• Subjects: Linear attenuation coefficient -- Gamma-ray -- Self-attenuation; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2015.05.006
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: It is shown that the gamma-ray linear attenuation coefficient of a sample with unknown chemical composition can be determined through a systematic calibration of the correlation between the linear attenuation coefficient, gamma-ray energy and the relative degree of attenuation. For calibration, H2 O, MnO2, NaCl, Na2 CO3 and (NH4 )2 SO4 were used as reference materials. Point-like gamma-ray sources with modest activity of approximately 37 kBq, along with an HPGe detector, were used in the measurements. A semi-empirical formula was derived to calculate the linear attenuation coefficients as a function of the relative count rate and the gamma-ray energy. The method was applied to the determination of the linear attenuation coefficients for K2 CrO4 and SiO2 test samples in the same setup used in calibration. The experimental result agreed well with the ones calculated by elementary data. Highlights: The gamma-ray linear attenuation coefficient of a compound is determined using wide-beam collimation-free transmission measurements, and calibration curves. An experimental procedure is presented and applied to test samples.