Abstract
New measurements are reported which show beta particlesemitted from 3H and 14C sources being directly detected with GaAsmesa photodiodes without use of scintillators. Spectra accumulated with GaAsdiodes which were originally developed for X-ray spectroscopy are presentedwhich show that individual beta particles from these sources can be countedand the energy they deposit in the detector measured. Potential longer termapplications of this technology as it is developed further and improvedinclude space missions, autoradiography, monitoring tritium produced byfusion reactors and nuclear decommissioning.
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