A monitoring method for mobile radioactive iodine

Abstract

The invention discloses a mobile radioactive iodine monitoring method, comprising steps: 1. determining a radioactive iodine detector and constructing a mobile radioactive iodine device; 2. determining the cross-sectional shape and size of an NaI scintillator; 3. determining the NaI scintillation 4. Determine the distance between the NaI scintillator and the activated carbon iodine box; 5. Determine the thickness of the shielding body in the detection room and the thickness and height of the shielding body in the middle of the detector; 6. Monitoring of radioactive iodine. The present invention changes the existing side measurement method, and uses the detection end of the NaI detector to extend into the shielded detection chamber and cooperate with the activated carbon iodine box up and down to detect the radioactive iodine adsorbed in the activated carbon iodine box, which can improve the detection efficiency and To reduce the lower detection limit, the active carbon iodine box and the NaI detector’s detection end crystal adopt a thick shielding layer, and the rear end shell of the detector is adaptively thinned, which can achieve the goal of miniaturization and light weight of the entire detection device.

Description

technical field [0001] The invention belongs to the technical field of radioactive iodine detection, and in particular relates to a mobile radioactive iodine monitoring method. Background technique [0002] Because the existing radioactive iodine detection device adopts the method of measuring the air intake side of the end face, the sampling of radioactive iodine is not representative, and cannot truly characterize the actual situation of radioactive iodine in the environment. The solid angle is small, and the crystal size of the NaI detector is 25.4mm×30.8mm, resulting in a low detection efficiency of the NaI detector for radioactive iodine, resulting in a high minimum detectable activity, which means that the lower limit of detection cannot meet the requirements of use . On the other hand, the method of measuring laterally from the side will increase the size and weight of the entire detection device, which cannot meet the actual use requirements in places with limited s...

AI Technical Summary

Problems solved by technology

[0002] Because the existing radioactive iodine detection device adopts the method of measuring the air intake side of the end face, the sampling of radioactive iodine is not representative, and cannot truly characterize the actual situation of radioactive iodine in the environment. The solid angle is small, and the crystal size of the NaI detector is 25.4mm×30.8mm, resulting in a low detection efficiency of the NaI detector for radioactive iodine, resulting in a high minimum detectable activity, which means that the lower limit of detection cannot meet the requirements of use

On the other hand, the method of measuring laterally from the side will increase the size and weight of the entire detection device, which cannot meet the actual use requirements for places with limited space.

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