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Precise beta-branching-ratio measurements are required in order to determineft-values as a part of our program to test the Electroweak Standard Model viaunitarity of the Cabibbo-Kobayashi-Moskawa matrix. For the measurements to beuseful in this test, their precision must be close to 0.1 %. In abranching-ratio measurement, we position the radioactive sample between a thinplastic scintillator used to detect beta-particles, and a HPGe detector forgamma-rays. Both beta singles and beta-gamma coincidences are recorded.Although the branching ratio depends most strongly on the HPGe detectorefficiency, it has some sensitivity to the energy dependence of thebeta-detector efficiency. We report here on a study of our beta-detectorresponse function, which used Monte Carlo calculations performed by the Geant4toolkit. Results of the simulations are compared to measured beta-spectra fromseveral standard beta-sources.

The use of Geant4 for simulations of a plastic beta-detector and its application to efficiency calibration