EMILIA, the LS counting efficiency for electron-capture and capture-gamma emitters Original Research Article

This version includes new aspects that improve the computation of the counting efficiency for each one of the three available atomic rearrangement detection models (i.e., KLM, KL1L2L3M and KLMN). The first modification involves a correction algorithm that simulates the non-linear response of the detector to photoionization for low-energy X-ray photons. Although this correction has the inconvenience of substantially increasing the number of atomic rearrangement detection pathways, the computed counting efficiency for low-Z nuclides is reduced by 2% for moderate quenching in agreement with experiment. The program also simulates how the addition of extra components, such as a quencher or aqueous solutions, affects the counting efficiency. Since the CIEMAT/NIST method requires identical ionization quench functions for the electron-capture nuclide and the tracer, the computation of the counting efficiency for 3H, the low-energy beta-ray emitter commonly used as tracer, is included in the program as an option.