Abstract
The ASTRO-E hard X-ray detector utilizes GSO(Gd2SiO5:Ce 0.5% mol)-BGO(Bi4Ge3O12) well-type phoswich counters [1] in compound-eye configuration to achieve an extremely low background level of about a few times 10-5 counts s-1 cm-2 keV-1. The GSO scintillators placed at the bottom of the BGO well observe photons in the energy range 30-600 keV. To cover the lower energy range of 10-60 keV, silicon p-i-n diodes of 2 mm in thickness and 21.5×21.5 mm2 in size were newly developed and placed in front of the GSO scintillators. The p-i-n diode exhibits complex spectral responses, including subpeak and low energy tail components. To examine the origin of these components, we measured the spatially resolved response of the p-i-n diode and confirmed that the subpeak and the low energy tail are related to the electrode structures and electric fields in the p-i-n diode, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 426-429 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Nuclear Science |
| Volume | 48 |
| Issue number | 3 I |
| DOIs | |
| State | Published - Jun 2001 |
| Externally published | Yes |
| Event | 2000 Nuclear Science Symphosium (NSS) - Lyon, France Duration: 15 Oct 2000 → 20 Oct 2000 |
Keywords
- ASTRO-E
- Hard X-ray detector
- P-i-n silicon diode
- Spectral response