Pulse Filtering for Thick Mercuric Iodide Detectors

Gerrish, V.; Williams, Derek J.; Beyerle, A.

doi:10.1109/tns.1987.4337307

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…Despite the lack of a photopeak with the conventional planar electrodes, HgI spectra have previously been improved by incorporating pulse compensation techniques [12]. Fig.…”

Section: Generated Spectra From a Cs-137 Sourcementioning

confidence: 99%

Spectroscopy on thick HgI/sub 2/ detectors: a comparison between planar and pixelated electrodes

Baciak

2003

IEEE Trans. Nucl. Sci.

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Thick mercuric iodide (HgI 2 ) detectors are investigated as potential room temperature gamma-ray spectrometers. By using pixelated anodes the induced charge on the electrode is dependent mainly on electron movement and is almost independent of the depth of interaction. Moreover, by reading out the planar cathode signal simultaneously, the depth of interaction can be determined and any effects of electron charge loss can be corrected. By combining these two methods (pixelated anodes and depth sensing), the resolution from 1 cm thick HgI 2 devices can be improved to 1.4% FWHM when using a Cs-137 point source. These results were obtained using a modest electric field (2500 V/cm) and relatively short shaping times (4-16 s) for HgI 2 . A comparison between conventional planar readout and single polarity charge sensing techniques with wide band-gap semiconductors is discussed.Index Terms-Gamma-ray spectroscopy, mercuric iodide, room temperature.

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“…Despite the lack of a photopeak with the conventional planar electrodes, HgI spectra have previously been improved by incorporating pulse compensation techniques [12]. Fig.…”

Section: Generated Spectra From a Cs-137 Sourcementioning

confidence: 99%

Spectroscopy on thick HgI/sub 2/ detectors: a comparison between planar and pixelated electrodes

Baciak

2003

IEEE Trans. Nucl. Sci.

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“…In order to perform the further investigation of the effect due to the difference between the hole and electron mobility, we utilized the pulse-shape analysis by means of dual shaping times. The technique was previously employed to improve the energy resolution of HgI 2 [11] [12]. With this technique, we can study the timing resolution with respect to the shape of the signal.…”

Section: Pulse-shape Selection With Dual Shaping Timesmentioning

confidence: 99%

CdTe and CdZnTe detectors for timing measurements

Okada

Takahashi

Sato

et al. 2002

IEEE Trans. Nucl. Sci.

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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 241 Am doped plastic scintillator. We confirmed that the low mobility and short life time 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 nsec. We also discussed the application of CdTe to Positron Emission Tomography, 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 3 time better timing response than a geometry when the electrodes are perpendicular to the γ-ray beam.

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“…Table 1 summarizes some of the important reports from various works [9][10][11][12][13][14][15][16][17][18] on spectroscopic performance of HgI 2 detectors for 662 keV gamma rays. The first part of the table shows results in planar detectors reported till date.…”

Section: Jinst 7 T04002mentioning

confidence: 99%

Digital pulse height correction in HgI₂γ-ray detectors

et al. 2012

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We report on the application of digital pulse processing algorithms to improve the spectroscopic performance of a 1.2 mm thick planar HgI 2 γ-ray detector. We have used offline processing of pulses which were recorded using a high resolution waveform digitizer. The recovery processes include long duration shaping to avoid ballistic deficit in the case of slow pulses, and the application of biparametric correction techniques to compensate for charge loss. Pulses of duration as long as 100 µs were recorded to facilitate long duration shaping. Two different pulse processing algorithms, viz. semi-Gaussian and moving window deconvolution, were applied and their performance was compared. The application of long duration shaping and digital chargeloss correction improved the energy resolution at 662 keV by more than 20% and the peak to background ratio by a factor of two. The resolution and the peak to background ratio were further seen to improve drastically upon rejection of counts with very slow rise-time. A 2.6% energy resolution at 662 keV with 14:1 peak to background ratio was obtained.

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Pulse Filtering for Thick Mercuric Iodide Detectors

Cited by 13 publications

References 12 publications

Spectroscopy on thick HgI/sub 2/ detectors: a comparison between planar and pixelated electrodes

Spectroscopy on thick HgI/sub 2/ detectors: a comparison between planar and pixelated electrodes

CdTe and CdZnTe detectors for timing measurements

Digital pulse height correction in HgI₂γ-ray detectors

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Pulse Filtering for Thick Mercuric Iodide Detectors

Cited by 13 publications

References 12 publications

Spectroscopy on thick HgI/sub 2/ detectors: a comparison between planar and pixelated electrodes

Spectroscopy on thick HgI/sub 2/ detectors: a comparison between planar and pixelated electrodes

CdTe and CdZnTe detectors for timing measurements

Digital pulse height correction in HgI2γ-ray detectors

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Product

Resources

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Digital pulse height correction in HgI₂γ-ray detectors