摘要
Objective:This study is aimed to measure the Bremsstrahlung spectrum produced by ^(204)Tl in barium compounds such as BaCl_(2),BaCO_(3),Ba(NO_(3))_(2),BaSO_(4) and BaTiO_(3).It is also aimed to study the attenuation of bremsstrahlung in the given compounds.Materials and methods:Bremsstrahlung spectrum and yield ^(204)Tl in barium compounds such as BaCl_(2),BaCO_(3),Ba(NO_(3))_(2),BaSO_(4) and BaTiO_(3) have been measured using NaI(Tl)detector and multichannel analyzer(MCA).The beta stopper technique is employed to measure the bremsstrahlung spectrum.Liden-Starfelt procedure is used to unfold the measured raw spectrum.The unfolded spectra were compared with Tseng–Pratt theory.Results:The measured spectra agree with the theory at low energy end of spectrum and some deviation(less than 10%)at higher energy end of spectrum.Attenuation of the bremsstrahlung,excited by ^(204)Tl beta emitters in the same compounds,is also studied.The measured attenuation parameter is not constant with absorber thickness and it increases with increasing Zmod of the absorber.Conclusion:The discrepancy between measured spectrum and theory increases with Zmod of the target compound and photon energy.The attenuation of bremsstrahlung may be represented as a combination of a large number of exponential terms rather than single term.
