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|Title:||Inflight proton activation and damage on a CdTe detection plane||Authors:||Simões, N.
Maia, J. M.
Curado da Silva, R. M.
do Carmo, S. J. C.
|Issue Date:||2018||Journal:||NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT||Number:||877||First Page:||183||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 ∼300 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 cm<SUP>2</SUP> sensitive area and 2 mm thickness. To carry-out this study, several sets of measurements were performed under a ∼14 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 ∼1.3 ×10-<SUP>5</SUP> counts cm-<SUP>2</SUP> s-<SUP>1</SUP> keV-<SUP>1</SUP> up to 800 keV. A noticeable gamma-rays energy resolution degradation was registered (∼60% @ 122 keV, ∼14% @ 511 and ∼2.2% @ 1275 keV) after an accumulated proton fluence of 4.5 ×101<SUP>0</SUP> protons cm-<SUP>2</SUP>, equivalent to ∼22 years in-orbit fluence. One year later, the energy resolution of the irradiated prototype showed a good level of performancerecovery.||URI:||http://hdl.handle.net/20.500.12386/29432||URL:||https://www.sciencedirect.com/science/article/pii/S0168900217309841?via%3Dihub||ISSN:||0168-9002||DOI:||10.1016/j.nima.2017.09.017||Bibcode ADS:||2018NIMPA.877..183S||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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