Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5492524 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2018 | 21 Pages |
Abstract
Future high-energy space telescope missions require further analysis of orbital environment induced activation and radiation damage on main instruments. A scientific satellite is exposed to the charged particles harsh environment, mainly geomagnetically trapped protons (up to â¼300 MeV) that interact with the payload materials, generating nuclear activation background noise within instruments' operational energy range and causing radiation damage in detector material. As a consequence, instruments' performances deteriorate during the mission time-frame. In order to optimize inflight operational performances of future CdTe high-energy telescope detection planes under orbital radiation environment, we measured and analyzed the effects generated by protons on CdTe ACRORAD detectors with 2.56 cm2 sensitive area and 2 mm thickness. To carry-out this study, several sets of measurements were performed under a â¼14 MeV cyclotron proton beam. Nuclear activation radionuclides' identification was performed. Estimation of activation background generated by short-lived radioisotopes during one day was less than â¼1.3Ã10â5 counts cmâ2 sâ1 keVâ1 up to 800 keV. A noticeable gamma-rays energy resolution degradation was registered (â¼60% @ 122 keV, â¼14% @ 511 and â¼2.2% @ 1275 keV) after an accumulated proton fluence of 4.5Ã1010 protons cmâ2, equivalent to â¼22 years in-orbit fluence. One year later, the energy resolution of the irradiated prototype showed a good level of performancerecovery.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
N. Simões, J.M. Maia, R.M. Curado da Silva, S. Ghithan, P. Crespo, S.J.C. do Carmo, Francisco Alves, M. Moita, N. Auricchio, E. Caroli,