Abstract
The given article considers radiation hardness of an X-ray detector used in production of non-destructive testing instruments and inspection systems. In the course of research, experiments were carried out to estimate radiation hardness of a detector based on cadmium tungstate crystal and its structural components individually. The article describes a layout of an experimental facility that was used for measurements of radiation hardness. The radiation dose dependence of the photodiode current is presented, when it is excited by a light flux of a scintillator or by an external light source. Experiments were carried out to estimate radiation hardness of two types of optical glue used in detector production; they are based on silicon rubber and epoxy. With the help of a spectrophotometer and cobalt gun, each of the glue samples was measured for a relative light transmission factor with different wavelengths, depending on the radiation dose. The obtained data are presented in a comprehensive analysis of the results. It was determined, which of the glue samples is most suitable for production of detectors working under exposure to strong radiation.
Highlights
Instrument facilities of customs inspection play an important role in solving tasks of cargo tracking
That is why studying radiation hardness of detector components and finding the most robust ones is of a particular practical interest
The obtained results show that reduction of photo-electric current by 20% in the assembly takes place when 8-9·105 rad dose is accumulated, whereas the single photodiode shows the same current reduction at 7-8·106 rad, i.e. is more radiation-proof by about an order
Summary
Instrument facilities of customs inspection play an important role in solving tasks of cargo tracking. One of the main requirements to detectors is stable sensitivity in the process of accumulation of the absorbed radiation dose. The samples under study (assembled detector first, photodiode separately) were placed at the output window of the gun collimator.
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