Abstract
An extremely low background betagammagamma coincidence spectrometer has been constructed for the measurement of cosmic ray produced radionuclides carried by extraterrestrial matter accreted on the Earth. The detectors used in this work are a large volume Ge(Li) detector, a pair of GM counters of thin layer type for beta counting, a large volume NaI(Tl) well scintillator and liquid scintillator for guard counter. Six counting modes are applicable; gamma only, gammagamma coincidence, Compton suppression, betagamma, (beta+gamma)gamma and betagammagamma counting modes. The absolute counting efficiency of the betagammagamma mode is slightly lower than that of the betagamma mode, however the figure of merit in the betagammagamma mode becomes better than that in the betagamma mode at higher energies.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
