A single energy gamma device

Abstract

The invention provides an irradiation device capable of producing a series of single-energy γ, which belongs to the technical field of nuclear technology application; the device includes a source storage well, a collimation diaphragm, a plurality of radiation sources, a scattering target, a scattering trap, a shutter and a shielding body. The invention improves the intensity of the radiation field, the radiation quality (good energy uniformity) and the economy of the device, and realizes the fixing of the detector, so that the precise experiment is feasible.

Description

technical field [0001] The invention belongs to the technical field of nuclear technology application, and in particular relates to a single-energy gamma device. Background technique [0002] Gamma rays (or X-rays) are short-wavelength electromagnetic waves with particle characteristics and strong penetrating power. They can be used in industry for flaw detection or automatic control of assembly lines. Gamma rays are lethal to cells and are used in medical treatment. tumor. Using the detector to monitor the gamma ray intensity can ensure the safety of the device and the validity of the experimental data. Radiation devices usually contain gamma rays of various energies, which are distributed in the range of tens of keV to several MeV. For gamma rays below 1MeV, the sensitivity of the detector has a relatively obvious energy dependence, and the energy response curve needs to be calibrated before use. The commonly used method for obtaining the energy-response curve is to use...

AI Technical Summary

Problems solved by technology

[0006] 1) Only a single radiation source is used, the intensity of scattered gamma rays is low, and the highest fluence rate is about 10 5 cm -2 ·s -1 , which greatly limits the development of low-sensitivity detector calibration experiments;

[0007] 2) In the experiment, it is necessary to rotate the detector to adjust the scattering angle, and the vibration during the movement may change the assembly state of the detector, such as the displacement of accessories, etc., but rotating the detector is not conducive to the calibration experiment of precision detectors;

[0008] 3) In order to improve the energy uniformity of scattering γ, use high specific activity (hundreds of curie per gram), small size high specific activity source, and reduce the energy dispersion introduced by the geometric size of the source. The price is expensive, which is tens to hundreds of times that of industrial sources (tens of curies per gram), and the economical efficiency of the device is not high;

[0010] To sum up, for the above-mentioned multi-energy point gamma-ray device, the current technical solutions mainly have the following deficiencies: the intensity of single-energy gamma in the range of 350keV to 660keV is not enough; the price of raw materials is high; the signal-to-noise ratio of the gamma beam is low; rotation detection is required to adjust the scattering angle, which is not conducive to precision experiments

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