## AN UNITED METHOD CALCULATING NEUTRON FLUENCE ATTENUATION AND GAMMA-RAY SELF-ABSORPTION IN A LARGE CYLINDRICAL SAMPLE FOR (n,xγ) EXPERIMENTInstitute of Low Energy Nuclear PhysicsBeijing Normal University, Beijing, China An united formula calculating neutron fluence attenuation and gamma-ray self-absorption in a large cylindrical sample was proposed, which can be used in measurements of gamma-ray production cross sections from fast neutron induced (n,xγ) reactions. The position correlation of these two effects was taken into account in the deduction. The formula has obvious physical meaning. The preliminary calculations were completed at a IBM-PC microcomputer, the comparisons with some other methods were made, and satisfactory results were obtained. KEYWORDS: nuclear reaction, cylindrical sample, neutron fluence attenuation, gamma-ray self-absorption, gamma-ray production cross section |