The feasibility of boron containing phosphors in thermal neutron image plates, in particular the systems M2B5O9X /: Eu2+ /(M=Ca, /Sr, /Ba; /X=Cl, /Br). Part I: simulation of the energy deposition process
A thermal neutron image plate (IP) consisting of a mixture of BaFBr : Eu 2+ and Gd 2O 3 (IP-Gd) is compared with an alternative plate consisting of M2B5O9X : Eu 2+ ( M= Ca, Sr, Ba; X= Cl,Br) (IP-B). In particular, the Detective Quantum Efficiency (DQE) of both plates is considered. Monte Carlo simulations of the energy deposition process after the absorption of a neutron show that the variance of the energy deposition in the IP-Gd affects the DQE to a large extent. Because of this, the average number of photoelectrons detected per incident neutron, < Nphe>, has to be only 1.3 for the haloborates to obtain an IP-B with a higher DQE value than the maximum possible with a IP-Gd.