DETECTOR OF HARD GAMMA RAY FLUXES WITH THE MINIMUM PHYSICAL NOISE OF THE IMAGE AND ENHANCED REGISTRATION EFFICIENCY
S.S. Afanasenko1, R.R. Akhmetshin1,2, D.N. Grigoriev1,2,3, V.F. Kazanin1,2, V.V. Porosev1, A.V. Timofeev1, R.I. Shcherbakov1
1Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
3Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: scintillators, wavelength shifting fiber, radiography
Abstract
The challenges of the x-ray inspection of steel objects with a thickness of 100 mm and more are discussed. In the classical readout method, semiconductor photosensors are located directly on scintillators. As a result, the background interaction of gamma radiation with the photosensor material is responsible for image noise and causes negative effects in the readout electronics. The method proposed to design registration system with using the wavelength shifters is free from disadvantages of the classical method. This method allows one to achieve smaller noise of the image as compared to the classical method, avoid the gamma radiation impact on electronics, and enhance the inspection efficiency. Various ways of implementation of the proposed method are experimentally studied, and optimal methods are chosen. Based on the investigations performed, a design of the registration element is proposed, and results of measuring its parameters are reported.
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