System and method for rotatably obtaining strong pulse gamma radiation field by thickness collimator

Abstract

The invention relates to a system and a method for rotatably obtaining a strong pulse gamma radiation field by a thickness collimator. A rotor and a fixed housing are combined to form a combined shutter which has a good shielding function and is convenient to rotate at a high speed so as to cut pulse of a stable gamma ray. The fixed housing is a section of cylindrical body which is internally sleeved with a rotary collimator provided with a through hole or a trough. An extremely small gap is reserved between two substances for controlled rotation of the rotor at the high speed. The rotating manner can be realized by a way of a roller, floating or magnetic levitation and the like, so that the narrow pulse of the gamma ray is further formed. The fixed housing is arranged, so that the weight of the rotary collimator is reduced, shielding to scattered rays around the rotor is increased, the quality parameter of the collimator after pulse incision is improved, and the weight of the rotary collimator is effectively reduced, so that a higher rotating speed is conveniently formed and the narrow pulse is obtained.

Description

technical field [0001] The invention belongs to the research on the acquisition method of the pulsed radiation field, and specifically relates to a system and method for cutting the steady-state beam current of the gamma ray radiation field and obtaining fast pulses through the method of high-speed rotation of a thick collimator, which is a measure of ionizing radiation an important research direction. Background technique [0002] Acquisition of pulsed radiation field is the basic condition for the development of pulsed ionizing radiation metrology technology. Due to the lack of pulsed gamma radiation field (that is, known radiation field parameters) in existing calibration laboratories, pulsed ionizing radiation metrology is basically at a stagnation stage. At present, most detection systems and metering equipment used for pulse measurement are calibrated or calibrated based on the steady-state gamma radiation field generated by cobalt and cesium sources. Bias that is dif...

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Problems solved by technology

The above methods have certain applications in obtaining low-intensity, millisecond pulses, but are limited by the intensity and pulse width, and their practicability is not strong, mainly in the following aspects: 1) The γ-ray penetration ability is strong, Protection requires a certain shielding thickness, which makes the mass of the collimator used for beam limitation huge, and it is difficult to use a chopper to realize the rapid rotation of the collimator; 2) For strong radioactive sources, it is difficult to It is fixed on the edge of the high-speed rotating turntable, and the solution of the radiation source rotation also limits its speed to reach tens of thousands of revolutions

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