Neutron detector

Abstract

The invention provides a neutron detector. The neutron detector comprises a neutron slowing-down body, a 3He neutron tube arranged in the neutron slowing-down body and a pre-amplifier assembly arranged at the end of the neutron slowing-down body. The neutron detector is miniature and high in sensitivity and is provided with the highly sensitive 3He neutron tube and the low-noise amplifier assembly, various effective measures are adopted in the technology to restrain interfering noise to a lower range, and therefore the problem of false alarm caused by the interfering noise is effectively solved.

Description

technical field [0001] The invention relates to a neutron detector, in particular to a neutron detector of a portable device. Background technique [0002] In the existing neutron detection, the gas detector is generally used. Since the gas detector needs a stable high voltage as the bias voltage when it works, and the output signal is very small, a high amplification factor is usually used. The charge sensitive amplifier collects and amplifies the neutron signal. Under the condition of high voltage and high gain, it is easy to amplify the introduced interference noise together. Sometimes the interference noise may be amplified to an amplitude equivalent to that of the neutron signal; The neutron background in the natural environment in the field of neutron detection is extremely low, as long as there is a small amount of noise, it may have a serious impact on neutron detection, which will cause false alarms in the neutron detection system. [0003] In the existing neutron ...

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Problems solved by technology

[0002] In the existing neutron detection, the gas detector is generally used. Since the gas detector needs a stable high voltage as the bias voltage when it works, and the output signal is very small, a high amplification factor is usually used. The charge sensitive amplifier collects and amplifies the neutron signal. Under the condition of high voltage and high gain, it is easy to amplify the introduced interference noise together. Sometimes the interference noise may be amplified to an amplitude equivalent to that of the neutron signal; The neutron background in the natural environment in the field of neutron detection is extremely low, as long as there is a small amount of noise, it may have a serious impact on neutron detection, which will cause false alarms in the neutron detection system

[0003] In the existing neutron detectors, due to the presence of high-gain, high-voltage circuits, it is also a major test in terms of environmental adaptability. Under relatively high humidity, the amplitude of interference noise can increase significantly, even higher than the detected neutron signal, so it is difficult to distinguish the interference noise from the neutron signal;

[0004] Therefore, a neutron detector for portable equipment is needed. The neutron detector is designed by comprehensively considering the characteristics of high working voltage, small signal, easy generation of various interference noises, and poor environmental adaptability, so as to suppress the interference noise at a low level. range, effectively solves the problem of false alarms caused by interference noise, and can be effectively applied in portable devices

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