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Segmented Ge detector rejection of internal beta activity produced by neutron irradiation

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7 Author(s)
Varnell, L.S. ; Jet Propulsion Lab., Pasadena, CA, USA ; Callas, J.L. ; Mahoney, W.A. ; Pehl, R.H.
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Future Ge spectrometers flown in space to observe cosmic gamma-ray sources will incorporate segmented detectors to reduce the background from radioactivity produced by energetic particle reactions. To demonstrate the effectiveness of a segmented Ge detector in rejecting background events due to the beta decay of internal radioactivity, a laboratory experiment has been carried out in which radioactivity was produced in the detector by neutron irradiation. A 252Cf source of neutrons was used to produce, by neutron capture on 74 Ge (36.5% of natural Ge) in the detector itself, 75Ge ( t1/2=82.78 min), which decays by beta emission with a maximum electron kinetic energy of 1188 keV. By requiring that an ionizing event deposit energy in two or more of the five segments of the detector, each about 1-cm thick, the beta particles, which have a range of about 1-mm, are rejected, while most external gamma rays incident on the detector are counted

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Nuclear Science, IEEE Transactions on  (Volume:38 ,  Issue: 2 )