Monte-Carlo simulation of a compact gamma-ray detector using wavelength-shifting fibers coupled to a YAP scintillation crystal

ZHU Jie; MA Hong-Guang; MA Wen-Yan; ZENG Hui; WANG Zhao-Min; XU Zi-Zong

doi:10.1088/1674-1137/32/5/010

Chinese Physics C> 2008, Vol. 32> Issue(5) : 377-380 DOI: 10.1088/1674-1137/32/5/010

Monte-Carlo simulation of a compact gamma-ray detector using wavelength-shifting fibers coupled to a YAP scintillation crystal

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Abstract：
The production and transportation of fluorescent light produced in wavelength-shifting fibers (WSFs) coupled to YAP scintillation crystal is simulated using the GEANT4 codes. An advantage of the wavelength-shifting fiber readout technique over a direct readout with a position-sensitive photo-sensor is the reduced requirement for position sensitive photomultiplier tube photocathode area. With this gamma-ray detector, the gamma camera is small and flexible and has larger effective field of view and low cost. Simulation results show that a) a mean 12 of photons per 59.5 keV gamma ray interaction is produced in the WSF located nearest to the incident gamma ray, and a spatial resolution of 3.6 mm FWHM is obtained, b) a mean 27 of photons per 140 keV gamma ray interaction is produced and a spatial resolution of 3.1 mm FWHM is obtained. Results demonstrate the feasibility of this concept of a compact gamma-ray detector based on wavelength-shifting fibers readout. However, since the very low photoelectron levels, it is very important to use a photon counting device with good single photo-electron response to readout the WSFs.

References

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. Garibaldi F, Cisbani E, Cusanno F et al. Nucl. Instrum.Methods A, 2001, 471: 2222. Soares A J et al. IEEE Trans. Nucl. Sci., 2000, 47(3): 10583. Hamamatsu Photomultiplier Tube Hamamatsu Photonics K.K. Electron Tube Center, Position Sensitive Photomultiplier Tube with Crossed Wire Anodes R2486 Series. Speci cations Manual. Japanese, 19934. ZENG Hai-Ning, XU Zi-Zhong, WANG Zhao-Min et al.HEP NP, 2000, 24(2): 165 (in Chinese)5. ZENG Hai-Ning et al. Acta Photonica Sinica, 2001, 30(11):13216. Baccaro S et al. Nucl. Instrum. Methods A, 1995, 361: 2097. Kuraray's Scintillation Materials. Speci cations Manual. Nihonbashi, chuo-ku, Tokyo 103-8254. Japan8. Barone L H et al. Nucl. Instrum. Methods A, 1995, 360:3029. ZHU Jie et al. Acta Photonica Sinica, 2006, 35(10): 149710. Del Guerra A et al. IEEE Trans. Nucl. Sci., 2001, 48(4):1108

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ZHU Jie, MA Hong-Guang, MA Wen-Yan, ZENG Hui, WANG Zhao-Min and XU Zi-Zong. Monte-Carlo simulation of a compact gamma-ray detector using wavelength-shifting fibers coupled to a YAP scintillation crystal[J]. Chinese Physics C, 2008, 32(5): 377-380. doi: 10.1088/1674-1137/32/5/010

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Received: 2007-09-10
Revised: 2007-12-07

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Monte-Carlo simulation of a compact gamma-ray detector using wavelength-shifting fibers coupled to a YAP scintillation crystal

Corresponding author: ZENG Hui,

Received Date: 2007-09-10

Accepted Date: 2007-12-07

Available Online: 2008-05-05

Abstract:

The production and transportation of fluorescent light produced in wavelength-shifting fibers (WSFs) coupled to YAP scintillation crystal is simulated using the GEANT4 codes. An advantage of the wavelength-shifting fiber readout technique over a direct readout with a position-sensitive photo-sensor is the reduced requirement for position sensitive photomultiplier tube photocathode area. With this gamma-ray detector, the gamma camera is small and flexible and has larger effective field of view and low cost. Simulation results show that a) a mean 12 of photons per 59.5 keV gamma ray interaction is produced in the WSF located nearest to the incident gamma ray, and a spatial resolution of 3.6 mm FWHM is obtained, b) a mean 27 of photons per 140 keV gamma ray interaction is produced and a spatial resolution of 3.1 mm FWHM is obtained. Results demonstrate the feasibility of this concept of a compact gamma-ray detector based on wavelength-shifting fibers readout. However, since the very low photoelectron levels, it is very important to use a photon counting device with good single photo-electron response to readout the WSFs.

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Monte-Carlo simulation of a compact gamma-ray detector using wavelength-shifting fibers coupled to a YAP scintillation crystal

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