Heat density calculation of the interaction of thermal neutrons with catalytic composition (Pb, Bi, Po) for variety value of the neutron flux by "IBUS" software

Abstract

The purpose of this work is to simulate by the "IBUS" software the heat release during the interaction of thermal neutrons with catalytic composition, which consist of isotopes Pb²⁰⁶, Pb²⁰7, Pb²⁰⁸, Pb²⁰⁹, Bi²⁰⁹, Bi²¹⁰, Po²¹⁰ for different values of the neutron flux. During the simulation, the concentration of the neutrons is not constant and depend on time until catalytic composition reaches the stable state which means the concentration is not changes any more. This stable state depends on the value of the neutron flux, which is changes in the range 10¹³ and 10¹⁶ per cm². For simulating the change of concentration process and for calculating the concentration of isotopes products the "IBUS" (Isotopes Burn Up Software) software was developed on C# using deterministic methods. The program can also be used to calculate the concentration of products to be produced and for many other problems associated with the irradiation of isotopes by thermal neutrons. Using this code we calculated heat density J/сm³sec of catalytic composition (Pb, Bi, Po). The initial concentrations of each isotope of the catalytic composition was calculated in works [1-7].