Nuclear radiation detecting system and method applied to security check field

Abstract

The invention discloses a nuclear radiation detecting system and method applied to the security check field. The method improves the traditional nuclear radiation detecting technology according to the special requirements in the security check field to further improve the measurement instantaneity and accuracy. The system comprises a detector, an integral circuit, an analog-digital converter, a comparer-counter array and a controller. The method comprises the following steps: (1) particle radiation energy signals in a nuclear radiation particle bombardment detector are converted to electric pulse signals through the photoelectric effect; (2) the electric pulse signals pass through the comparer-counter array to obtain a radiation particle energy distribution condition; (3) a nuclear radiation accumulation amount of the electric pulse signals in time T is obtained through the integral circuit, and the integral time T is determined by radiation particle energy distribution information; (4) output of the integral circuit is converted to a digital quantity through the analog-digital converter; the digital quantity is divided by the time T to obtain nuclear radiation dose information in unit time.

Description

technical field [0001] The invention belongs to the field of measurement of nuclear radiation or X-ray radiation, and in particular relates to a nuclear radiation detection system and method applied in the field of security inspection. Background technique [0002] The traditional nuclear radiation measurement method is generally to obtain the corresponding electric pulse signal through the photoelectric effect excited by the bombardment of the photoelectric tube by high-energy particles, and then process the electric pulse signal through the processing integration circuit to obtain a stable output, and finally divide the result by Time to indirectly obtain the nuclear radiation dose per unit time. One of the difficulties of the above method is the selection of the integration time of the circuit, which is especially used in the security inspection field that has certain requirements for real-time and accuracy. If the integration time is too long, the real-time performance o...

AI Technical Summary

Problems solved by technology

One of the difficulties of the above method is the selection of the integration time of the circuit, which is especially used in the security inspection field that has certain requirements for real-time and accuracy. If the integration time is too long, the real-time performance of the measurement will be reduced, and accidents will be missed; if If the integration time is too short, errors will easily occur, resulting in frequent false positives.

Images