Dispersion type scintillation detector for impulse gamma detection

Abstract

The invention belongs to a radiator detecting device, in particular relating to a scattering-type scintillation detector for pulse and gamma-ray detection. An upper photoelectric device and a lower photoelectric device in the scintillation detector are respectively provided with the same electron filter, reflecting film, scintillation unit and photomultiplier which are arranged in symmetry. Therefore, the sensitivity difference between two detectors at both sides can be pre-set with the photoelectric device at one side as a background photoelectric device and the photoelectric device at the other side as a main signal detector. During measurement, a 3 millimeters thick granite sheet or aluminum sheet is added in front of the scintillation unit of the photoelectric device at one side to block electrons exiting out of a target so that the electrons are impossible to reach the scintillation unit, thus only surrounding gamma-ray and disturbance signals of neutrons are obtained. After time delay rectification and sensitivity rectification, the output signals of the two photoelectric devices are mutually deducted to obtain the true signals. Therefore, the scattering-type scintillation detector for pulse and gamma-ray detection can effectively deduct the disturbance caused by deficiency in shielding so as to improve the performance of detectors.

Description

technical field [0001] The invention belongs to a radiation detection device, in particular to a scattering scintillation detector for pulse gamma detection. Background technique [0002] Pulsed radiation field gamma ray diagnosis has the following three characteristics: 1. The radiation field is usually a mixed radiation field of pulsed neutrons and gamma rays, and the neutron intensity is sometimes several times higher than that of gamma rays, so the detector system is required to have Very high γ / n resolving power. 2. The pulsed gamma / X-ray energy spectrum cannot be accurately measured so far, and the intensity measurement requires the detection system to have a flat energy response; 3. The intensity span of the radiation field is large, and multiple detectors need to be used for joint measurement. [0003] In the existing pulsed gamma (γ) ray detection, two types of detector systems are mainly used: one is a scintillation detector composed of photoelectric devices such ...

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Problems solved by technology

2. The pulsed gamma / X-ray energy spectrum cannot be accurately measured so far, and the intensity measurement requires the detection system to have a flat energy response; 3. The intensity span of the radiation field is large, and multiple detectors need to be used for joint measurement

Scintillator-based photodetectors are highly sensitive and suitable for the measurement of low-intensity gamma-ray beams, and their sensitivities are usually in the range of 10 -10 -10 -20 C.cm 2 , but because scintillators and optoelectronic devices are more sensitive to neutrons, even if inorganic scintillators are used, the γ / n resolution is difficult to exceed 20 times. At the same time, this type of detector is based on energy harvesting. The detection sensitivity of the detector varies drastically with the energy, and the energy response to gamma-ray intensity measurement is not ideal; the Compton detector is a charge-collecting detector, and its intrinsic γ / n resolution can reach more than 50 times, but the Very low, usually around 10 -19 -10 -23 C.cm 2 , suitable for the measurement of high-intensity gamma-ray beam parameters, its energy response is flatter than scintillation detectors, but not ideal

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