Gamma radioactive source irradiator and transfer source reversing device

Abstract

The invention provides a gamma radioactive source irradiator and a transfer source reversing device, and belongs to the technical field of nuclear technology application. The irradiator comprises a split-type shielding assembly, a diaphragm, a shutter, a source rod and a shielding plug. The shielding assembly of the composite structure gives consideration to compactness and economical efficiency,so that the specification of the irradiator is small, and the ray utilization rate is increased. According to the gamma radioactive source irradiator, through cooperation of a source bin, a beam channel and a diaphragm, stray gamma rays are restrained, and the beam quality is guaranteed; the diaphragm also has an emergency shielding function; the source rod, the source channel and the shielding plug are matched to realize on-site source loading; and the irradiator provided by the invention has the advantages of compact structure, good radiation safety, high beam quality and on-site source loading function.

Description

technical field [0001] The invention belongs to the technical field of nuclear technology application, and in particular relates to a gamma radiation source irradiator and a transfer and source reversing device. Background technique [0002] Gamma rays are the rays released when the nuclear energy level transition is de-excited. They have strong penetrating power and can be used for flaw detection or automatic control of assembly lines in industry. Gamma rays are lethal to cells and are used to treat tumors in medicine. Using the detector to monitor the gamma ray intensity can ensure the safety of the device and the validity of the experimental data. Calibration or calibration is required before the detector is used. Point gamma radiation source irradiator is an important equipment for detector calibration experiment, which has the functions of radioactive source storage, ray beam collimation and control. The simple structure of the illuminator and redundant safety measure...

AI Technical Summary

Problems solved by technology

[0003] The radiation source of the existing gamma radiation source illuminator for detector calibration is placed in a lead shielding body, and a ball valve with a bell mouth is set between the radiation source and the collimation port, and the state replacement of the radiation source is realized through the ball valve. : 1) Using a single lead body shielding makes the shielding thicker, sacrificing the utilization efficiency of the radioactive source; 2) If the ball valve fails, it will bring great inconvenience to maintenance

The Chinese patent (publication number: CN101447241B) titled "γ-ray strong source irradiator" discloses a γ-radiation source irradiator, which adopts a double-layer shield, and the inner heavy metal shield (such as depleted uranium, tungsten alloy) and the outer layer The combination of layers of lead shielding reduces the size of the irradiator and improves the utilization rate of the radioactive source. The double shutter structure is designed to improve the safety of the device. The bearing rotates, and the outer shielding body relies on the cylinder to do linear motion. When the two sections of bell mouths overlap, the irradiator is turned on to generate beam current. The disadvantages of this technical solution are: 1) The device structure is relatively complicated, and the inner shielding body contains bearing parts. It is easy to wear and tear, and maintenance and replacement are time-consuming; 2) There are many structural parts, and the economic cost is high; 3) The source needs to be installed underwater, which has certain limitations, and the process is relatively cumbersome, and there is a risk of water seepage in bearings and other structures, which will affect the device. long-term reliability

It can be seen that the existing gamma radiation source irradiators have deficiencies in safety, economy, reliability and convenience, etc., which bring inconvenience to the long-term use of the irradiators

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