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Investigation of optical effects induced by gamma radiation in refractory elements

M -R. IOAN1, I. GRUIA2, P. IOAN1, I. L. CAZAN1, C. GAVRILA3

Affiliation

  1. “Horia Hulubei” National Institute for Nuclear Physics and Engineering, P.O. Box MG-6, RO-077125 Bucharest-Magurele, Romania
  2. Faculty of Physics, University of Bucharest, Romania
  3. Faculty of Building Services and Equipment, Technical University of Civil Engineering Bucharest, Romania

Abstract

A study of the effects of 60Co gamma radiation (E~1,25 MeV, dose rate level 96 Gy/h in air and 325 Gy/h in water pool) on the transmission of three optical glass types (BK-7, ZF-7, KU-1) to central value of band wavelengths: 415 nm-violet 473 nm-blue, 532 nm-green, 580 nm- yellow, 605 nm-orange, 685 nm-red and 800 nm -near infrared is presented. Optical glasses are similar to those of windows and lenses for video surveillance devices in radioactive environment [1-8] and processing lasers [9, 10, 11]. For such applications, gamma radiation induced optical degradation imposes a severe limitation. In all samples, the affected region is that of the visible light spectrum, especially in the ultraviolet region - bluegreen. Transmission spectra of the optical glasses analyzed in this study are presented as a function of the glass type and gamma radiation dose (up to 4 MGy). Transmission curves of three kinds glasses, irradiated during tens of hours to different doses of gamma radiation, were studied at room temperature under low or high level of gamma rays. It is therefore necessary to study the degradation of the optical properties for optical material, to assess system life-time. This loss of transmission is detrimental to the performance of optical systems and must be reduced to low level. Test results will be presented for glass radiation resistant and non-resistant to radiation and will be compared three types of glasses..

Keywords

Optical glass, refractors, gamma radiation, degradation of transmission.

Submitted at: Oct. 27, 2012
Accepted at: April 11, 2013

Citation

M -R. IOAN, I. GRUIA, P. IOAN, I. L. CAZAN, C. GAVRILA, Investigation of optical effects induced by gamma radiation in refractory elements, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 3-4, pp. 254-263 (2013)