A system for simultaneous beta and gamma spectroscopy

Farsoni, Abi T.; Hamby, D.M.

doi:10.1016/j.nima.2007.06.020

Cited by 30 publications

(24 citation statements)

References 17 publications

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“…[10] in the FIASCO experiment [12,13] used a digital technique for the identification of fast charged particles with a triple-layer phoswich detector. A digitizing board was designed and implemented and two digital algorithms were used for particle identification on the sampled data.…”

Section: A Phoswich Detectors and Signal Classification Methodsmentioning

confidence: 99%

“…Farsoni and D. Hamby [13,14] designed and constructed a triple-layer phoswich detector and electronic read-out system for simultaneous beta and gamma spectroscopy. The first two layers of the detector were chosen specifically for beta spectroscopy, with the third layer for gamma-ray measurement.…”

Section: A Phoswich Detectors and Signal Classification Methodsmentioning

confidence: 99%

“…The third layer is an inorganic scintillator (Nal(TI» with a 230 ns light decay constant. A quartz layer separates the third layer from second layer because plastic scintillators cannot be completely dried and would gradually destroy the performance of the third layer [13].…”

Section: A Phoswich Detectors and Signal Classification Methodsmentioning

confidence: 99%

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A fuzzy-based pulse shape discrimination in triple-layer phoswich detectors

Yousefi

Lucchese

2008

2008 IEEE Nuclear Science Symposium Conference Record

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In this paper, a new pulse shape discrimination algorithm for a triple-layer phoswich detector is implemented and tested. The three-layer detector which was used in this experiment was originally designed for simultaneous detection of beta particles and gamma rays in a mixed radiation field. The first two layers are specifically designed for beta particles and the third layer is designed for gamma-ray interaction. The pulse output of the photomultiplier is digitized and sent to the host computer for further processing. A de-noising algorithm based on the Wavelet Transform (WT) is implemented to reduce the effect of noise introduced by the noisy analog channel and by the photomultiplier tube. Three new timing features were extracted and given as input to a fuzzy interface system (FIS). The FIS output indicates to which scenario the input signal belongs. Compared to the non-fuzzy method which was initially implemented for this detector, the fuzzy algorithm shows a better performance in separating beta and gamma spectra, especially at high energies. Also, fewer pulses are rejected, due to classification as unknown pulses, and interaction in multiple layers is detected more efficiently.

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Section: A Phoswich Detectors and Signal Classification Methodsmentioning

confidence: 99%

Section: A Phoswich Detectors and Signal Classification Methodsmentioning

confidence: 99%

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A fuzzy-based pulse shape discrimination in triple-layer phoswich detectors

Yousefi

Lucchese

2008

2008 IEEE Nuclear Science Symposium Conference Record

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“…Our developed alpha-beta-gamma detector, which consists of three-layer scintillators optically coupled to each other and to a photomultiplier tube, provides good separation of these different types of radiations. Similar multilayered detectors for different types of radiations were also developed by other groups [4][5][6][7][8][9][10][11][12]. However, most of these layered detectors did not have the imaging capability.…”

Section: Introductionmentioning

confidence: 99%

Development of a three-layer phoswich alpha–beta–gamma imaging detector

Yamamoto

Ishibashi

2015

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tFor radiation monitoring at the sites of such nuclear power plant accidents as Fukushima Daiichi, radiation detectors are needed not only for gamma photons but also for alpha and beta particles because some nuclear fission products emit beta particles and gamma photons and some nuclear fuels contain plutonium that emits alpha particles. In some applications, imaging detectors are required to detect the distribution of plutonium particles that emit alpha particles and radiocesium in foods that emits beta particles and gamma photons. To solve these requirements, we developed an imaging detector that can measure the distribution of alpha and beta particles as well as gamma photons. The imaging detector consists of three-layer scintillators optically coupled to each other and to a position sensitive photomultiplier tube (PSPMT). The first layer, which is made of a thin plastic scintillator (decay time: $ 5 ns), detects alpha particles. The second layer, which is made of a thin Gd 2 SiO 5 (GSO) scintillator with 1.5 mol% Ce (decay time: 35 ns), detects beta particles. The third layer made of a thin GSO scintillator with 0.4 mol% Ce (decay time: 70 ns) detects gamma photons. Using pulse shape discrimination, the images of these layers can be separated. The position information is calculated by the Anger principle from 8 Â 8 anode signals from the PSPMT. The images for the alpha and beta particles and the gamma photons are individually formed by the pulse shape discriminations for each layer. We detected alpha particle images in the first layer and beta particle images in the second layer. Gamma photon images were detected in the second and third layers. The spatial resolution for the alpha and beta particles was $ 1.25 mm FWHM and less than 2 mm FWHM for the gamma photons. We conclude that our developed alpha-beta-gamma imaging detector is promising for imaging applications not only for the environmental monitoring of radionuclides but also for medical and molecular imaging.

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“…Most of these studies have considered the coincidence spectroscopy of beta-gamma-rays [1][2][3][4][5]. However, to best of our knowledge, a few reports are available about the development of phoswich detectors for alpha-gamma-rays coincidence spectroscopy.…”

Section: Introductionmentioning

confidence: 99%