VBLHEP Scientific and Methodical Seminar No. 7-2022

Date and Time: Thursday, 20 October 2022, at 11:00 AM

Venue: bld. 215, room 241, Veksler and Baldin Laboratory of High Energy Physics; online on Volna

Information about seminar and link to join online

Seminar topic: “Study on the effect of photon self-absorption on the detection efficiency of HPGe detector in measurements of an activated uranium sample”

Authors: T. N. Tran[1,2], J. H. Khushvaktov[1], I. A. Kryachko[1], V. I. Stegailov[1], S. I. Tuituinnikov[1], and A. A. Abduvaliev[1]

[1] – JINR (Dubna)
[2] – Institute of physics, Vietnam Academy of Science and Technology (Vietnam)

Speaker: Tran Ngoc Toan

Abstract:

The photon self-absorption effect of uranium on the full-energy peak (FEP) efficiency calibration of high purity germanium (HPGe) detector was studied as a function of energy using an activated uranium sample has a thickness of 1 mm. The absolute efficiencies of the detector were obtained with the use of gamma standard sources and gamma rays of radionuclides created by irradiating the uranium sample with secondary neutrons. The measurements were carried out with the use of a Planar HPGe detector. MCNP simulation code was used to verify the experimental results. The comparison of the empirical results with the simulation results showed a good agreement. To interpret the efficiencies, the reaction yields were calculated using two methods: the use of the efficiency curve of the standard sources combined with the self-absorption correction of the uranium material and the second one is the use of the efficiency curve obtained from gamma rays in the sample.