Abstract
We measured timing properties of CdTe and CdZnTe semiconductor detectors with planar configuration. We developed a new method to evaluate their performance in timing resolution utilizing an 241Am-doped plastic scintillator. We confirmed that the low mobility and short lifetime of holes are major obstacles to their timing resolution. However, their timing properties can be very much improved, either by applying a high electric field that increases the carrier speed or by selecting those events which are dominated by the electron signal. We demonstrated the latter through a pulse-shape discrimination technique using two different integration time constants. In conjunction with a newly developed CdTe diode, we obtained a superior timing resolution of 5.8 ns. We also discussed the application of CdTe to positron emission tomography (PET), employing the standard 511 keV gamma-gamma coincidence method. We confirmed that a geometrical configuration in which the electrodes are parallel to the incident γ-rays gives about three times better timing response than a geometry when the electrodes are perpendicular to the γ-ray beam.
| Original language | English |
|---|---|
| Pages (from-to) | 1986-1992 |
| Number of pages | 7 |
| Journal | IEEE Transactions on Nuclear Science |
| Volume | 49 I |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2002 Aug |
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Keywords
- CdTe
- CdZnTe
- Timing
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Nuclear Energy and Engineering
Cite this
CdTe and CdZnTe detectors for timing measurements. / Okada, Yuu; Takahashi, Tadayuki; Sato, Goro; Watanabe, Shin; Nakazawa, Kazuhiro; Mori, Kunishiro; Makishima, Kazuo.
In: IEEE Transactions on Nuclear Science, Vol. 49 I, No. 4, 08.2002, p. 1986-1992.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - CdTe and CdZnTe detectors for timing measurements
AU - Okada, Yuu
AU - Takahashi, Tadayuki
AU - Sato, Goro
AU - Watanabe, Shin
AU - Nakazawa, Kazuhiro
AU - Mori, Kunishiro
AU - Makishima, Kazuo
PY - 2002/8
Y1 - 2002/8
N2 - We measured timing properties of CdTe and CdZnTe semiconductor detectors with planar configuration. We developed a new method to evaluate their performance in timing resolution utilizing an 241Am-doped plastic scintillator. We confirmed that the low mobility and short lifetime of holes are major obstacles to their timing resolution. However, their timing properties can be very much improved, either by applying a high electric field that increases the carrier speed or by selecting those events which are dominated by the electron signal. We demonstrated the latter through a pulse-shape discrimination technique using two different integration time constants. In conjunction with a newly developed CdTe diode, we obtained a superior timing resolution of 5.8 ns. We also discussed the application of CdTe to positron emission tomography (PET), employing the standard 511 keV gamma-gamma coincidence method. We confirmed that a geometrical configuration in which the electrodes are parallel to the incident γ-rays gives about three times better timing response than a geometry when the electrodes are perpendicular to the γ-ray beam.
AB - We measured timing properties of CdTe and CdZnTe semiconductor detectors with planar configuration. We developed a new method to evaluate their performance in timing resolution utilizing an 241Am-doped plastic scintillator. We confirmed that the low mobility and short lifetime of holes are major obstacles to their timing resolution. However, their timing properties can be very much improved, either by applying a high electric field that increases the carrier speed or by selecting those events which are dominated by the electron signal. We demonstrated the latter through a pulse-shape discrimination technique using two different integration time constants. In conjunction with a newly developed CdTe diode, we obtained a superior timing resolution of 5.8 ns. We also discussed the application of CdTe to positron emission tomography (PET), employing the standard 511 keV gamma-gamma coincidence method. We confirmed that a geometrical configuration in which the electrodes are parallel to the incident γ-rays gives about three times better timing response than a geometry when the electrodes are perpendicular to the γ-ray beam.
KW - CdTe
KW - CdZnTe
KW - Timing
UR - http://www.scopus.com/inward/record.url?scp=0036702981&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036702981&partnerID=8YFLogxK
U2 - 10.1109/TNS.2002.801709
DO - 10.1109/TNS.2002.801709
M3 - Article
AN - SCOPUS:0036702981
VL - 49 I
SP - 1986
EP - 1992
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
SN - 0018-9499
IS - 4
ER -