Abstract
Low energy gamma-ray detectors play an important role in diagnosis in nuclear medicine, in detection of gamma-ray bursts for gravitational wave research and in detection of underground nuclear tests. The silicon positive-intrinsic-negative (PIN) diode detector is useful for detection of low energy gamma radiation without using a scintillator because it generates a high signal in a small active volume, has a fast response time and has good intrinsic energy resolution. We measured the detector responses, energy resolutions and signal-to-noise ratios for various gamma energies by using manufactured silicon PIN diode and photodiodes. Radioactive gamma sources, 241Am, 133Ba, and 57Co, providing gamma-rays with energies between 14.4 keV and 136.5 keV are used for the measurements. The energy resolution and the signal-to-noise ratio for 14.4 keV gamma-ray are measured to be 17.1 % and 12.8 for a 500 μm thick silicon diode. The energy resolutions measured at the FWHM for 59.5 keV and 122.1 keV gamma-rays by using the silicon diode are better by up to two times compared to those obtained using the NaI:Tl or the BGO scintillator with a photomultiplier tube. The dependence of detection speeds of the signals on the diode’s thickness is also measured.
Original language | English |
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Pages (from-to) | 1587-1590 |
Number of pages | 4 |
Journal | Journal of the Korean Physical Society |
Volume | 69 |
Issue number | 10 |
DOIs | |
State | Published - 1 Nov 2016 |
Keywords
- Detection speed
- Energy resolution
- Low energy gamma-ray
- Signal-to-noise ratio
- Silicon PIN diode