Determination of the effective sample thickness via radiative capture

摘要: Our procedure for determining the effective thickness of non-uniform irregular-shaped samples via radiative capture is described. In this technique, partial γ-ray production cross sections a compound nucleus produced in neutron-capture reaction are measured using Prompt Gamma Activation Analysis and compared to their corresponding standardized absolute values. For low-energy transitions, lower than standard values due significant photoelectric absorption γ rays within bulk-sample volume itself. Using theoretical techniques, amount self neutron shielding can then be calculated by iteratively varying sample until observed converge with known standards. The overall attenuation provides measure illuminated beam. This illustrated through powdered oxide comprising enriched 186W 182W from which tungsten-equivalent thicknesses deduced 0.077(3) mm 0.042(8) mm, respectively.