# EMI, the counting efficiency for electron capture, electron capture-gamma and isomeric transitions

## Description

Abstract A program is presented that calculates the counting efficiency in liquid scintillation systems for electron capture nuclides coincident with gamma or isomeric transitions. Compton interaction probabilities are not negligible for KL or KM photons in nuclides with atomic numbers greater than 30. This program uses Monte Carlo simulations to calculate the Compton spectrum of these photons for the vial geometry. Title of program: EMI Catalogue Id: ACPU_v1_0 Nature of problem The standardization in liquid scintillation counting of electron-capture nuclides (EC), EC coincident and non-coincident with gamma transitions and single isomeric transitions (IC) requires the determination of the counting efficiency. A detailed analysis of the different atomic rearrangements that follow the EC and IC processes, permits one to compute the counting efficiency as a function of a free parameter. However, the interaction of the energetic gamma and X-ray photons with the scintillato ... Versions of this program held in the CPC repository in Mendeley Data ACPU_v1_0; EMI; 10.1016/0010-4655(94)90234-8 ACPU_v2_0; EMI2; 10.1016/S0010-4655(99)00263-5 ACPU_v3_0; MICELLE; 10.1016/j.cpc.2006.11.002 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)