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Radiation resistivity of large CeF3 crystals
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH
Nuclear Instruments and Methods in Physics Research A328 (1993) 599-600 North-Holland
Section A
Letter to the Editor
Radiation resistivity of large CeF3 crystals Peter Kozma 1 , Sergei Afanasiev, Alexander Malakhov and Anatoli Povtoreiko
Laboratory of High Energies, JINR Dubna, P.O. Box 79, Head Post Office Moscow, Russian Federation
Received 26 November 1992 Radiation damage of a 3 x 3 x 6 cm 3 CeF3 crystal has been measured for doses up to 10 5 Gy. The degradation of transmission for this dose at the wavelength of the peak emission was found to be better than 5% per unit radiation length. Complete recovery of radiation damage was observed 60 days after the irradiations . In the framework of the experimental project SPHERE [1] realized at the Laboratory of High Energies of the JINR Dubna, we continue to investigate the properties of CeF3 scintillation crystals [2]. In this letter we report on the radiation hardness of a 3 x 3 x 6 cm 3 CeF 3 crystal at accumulated doses of low energy gamma-rays up to 10 5 Gy . The radiation resistivity was examined by measuring the transmission through the crystal before and after 60 Co gamma-ray irradiation . Two irradiation runs took 3.6 h for 10 4 Gy and 36 .5 h for 10 5 Gy. Measurements of transmission spectra were
100
before irradiation 60 days after irradiation
60 F20
CeF3
200 250 300 350 400 450 500 550 600 650
Wavelength (nm)
Fig. 2. Comparison of transmission spectra before and 60 days after irradiation by 105 (~y.
Wavelength (nm)
Fig. 1. Transmission spectra before and after 6° Co gamma-ray irradiations. The accumulated doses are attached to each curve.
I Permanent address: NPI R6z, Hurka 1060, 278 01 Kralupy n.Vlt .1, Czech Republic .
made 24 h after the irradiations . The transmission spectra before and after the irradiations by 10 4 and 10 5 Gy accumulated doses are displayed in fig. 1. The degradation of transmission for 10 4 Gy at the wavelength of the peak emission, A = 375 nm, was found to be about 1 .7% per the unit radiation length, Xo = 1.68 cm . The degradation of the transmission for 10 5 Gy at the same wavelength was found to be better than 5% per Xo. This result corresponds with measurements reported for small size CeF3 crystal [3]. The transmission spectrum measured 60 days after 10 5 Gy irradiation is shown in fig. 2. It shows complete recovery, the crystal has even a slightly better transmission at the shortest wavelengths than before irradiation .
0168-9002/93/$06.00 © 1993 - Elsevier Science Publishers B .V . All rights reserved
600
P. Kozma et al. / Radiation resistivity of CeF3 crystals
Acknowledgement A part of this program has been supported by the DAAD (Germany) and the EXERGIE AG (Switzerland) . References [1] A. Malakhov, Proc. XII Int. Conf. on Particles and Nuclei, PANIC XII, Cambridge, 1990, ed . T .W. Donnelly, contributed paper, X-26 .
[2] P. Kozma, S. Afanasiev, A. Malakhov and A. Povtoreiko, Nucl . Instr. and Meth . A322 (1992) 302. [3] M. Kobayasahi, M. Ishii, E.A. Krivandina, M.M . Litvinov, A.I . Peresypkin, Yu .D . Prokoshkin, V.I . Rykalin, B.P . Sobolev, K. Takamatsu and V.G . Vasil'chenko, Nucl . Instr. and Meth . A302 (1991) 443.
Nuclear Instruments and Methods in Physics Research A328 (1993) 599-600 North-Holland
Section A
Letter to the Editor
Radiation resistivity of large CeF3 crystals Peter Kozma 1 , Sergei Afanasiev, Alexander Malakhov and Anatoli Povtoreiko
Laboratory of High Energies, JINR Dubna, P.O. Box 79, Head Post Office Moscow, Russian Federation
Received 26 November 1992 Radiation damage of a 3 x 3 x 6 cm 3 CeF3 crystal has been measured for doses up to 10 5 Gy. The degradation of transmission for this dose at the wavelength of the peak emission was found to be better than 5% per unit radiation length. Complete recovery of radiation damage was observed 60 days after the irradiations . In the framework of the experimental project SPHERE [1] realized at the Laboratory of High Energies of the JINR Dubna, we continue to investigate the properties of CeF3 scintillation crystals [2]. In this letter we report on the radiation hardness of a 3 x 3 x 6 cm 3 CeF 3 crystal at accumulated doses of low energy gamma-rays up to 10 5 Gy . The radiation resistivity was examined by measuring the transmission through the crystal before and after 60 Co gamma-ray irradiation . Two irradiation runs took 3.6 h for 10 4 Gy and 36 .5 h for 10 5 Gy. Measurements of transmission spectra were
100
before irradiation 60 days after irradiation
60 F20
CeF3
200 250 300 350 400 450 500 550 600 650
Wavelength (nm)
Fig. 2. Comparison of transmission spectra before and 60 days after irradiation by 105 (~y.
Wavelength (nm)
Fig. 1. Transmission spectra before and after 6° Co gamma-ray irradiations. The accumulated doses are attached to each curve.
I Permanent address: NPI R6z, Hurka 1060, 278 01 Kralupy n.Vlt .1, Czech Republic .
made 24 h after the irradiations . The transmission spectra before and after the irradiations by 10 4 and 10 5 Gy accumulated doses are displayed in fig. 1. The degradation of transmission for 10 4 Gy at the wavelength of the peak emission, A = 375 nm, was found to be about 1 .7% per the unit radiation length, Xo = 1.68 cm . The degradation of the transmission for 10 5 Gy at the same wavelength was found to be better than 5% per Xo. This result corresponds with measurements reported for small size CeF3 crystal [3]. The transmission spectrum measured 60 days after 10 5 Gy irradiation is shown in fig. 2. It shows complete recovery, the crystal has even a slightly better transmission at the shortest wavelengths than before irradiation .
0168-9002/93/$06.00 © 1993 - Elsevier Science Publishers B .V . All rights reserved
600
P. Kozma et al. / Radiation resistivity of CeF3 crystals
Acknowledgement A part of this program has been supported by the DAAD (Germany) and the EXERGIE AG (Switzerland) . References [1] A. Malakhov, Proc. XII Int. Conf. on Particles and Nuclei, PANIC XII, Cambridge, 1990, ed . T .W. Donnelly, contributed paper, X-26 .
[2] P. Kozma, S. Afanasiev, A. Malakhov and A. Povtoreiko, Nucl . Instr. and Meth . A322 (1992) 302. [3] M. Kobayasahi, M. Ishii, E.A. Krivandina, M.M . Litvinov, A.I . Peresypkin, Yu .D . Prokoshkin, V.I . Rykalin, B.P . Sobolev, K. Takamatsu and V.G . Vasil'chenko, Nucl . Instr. and Meth . A302 (1991) 443.