Flying spot formation device and design method theref

Abstract

The invention discloses a flying spot formation device which comprises a radiation source and a shielding body, wherein at least two pairs of spiral grooves are formed in a side wall of the shielding body; each spiral groove has preset slope; a first incident slot is adjacent to a second incident slot; the head end of the first incident slot is higher than the head end of the second incident slot; the tail end of the first incident slot is higher than the tail end of the second incident slot; a preset distance is formed between the tail end of the first incident slot and the head end of the second incident slot; the tail end of the first incident slot is not higher than the head end of the second incident slot; a first axis section of the shielding body is intersected with the tail end of the first incident slot; a second axis section of the shielding body is intersected with the head end of the second incident slot; and an included angle between the first axis section and the second axis section is 0 degree. The invention also discloses a design method for the flying spot formation device. By utilizing the invention, the tensile property of the shielding body can be improved.

Description

technical field [0001] The invention relates to the technical field of radiation imaging, in particular to a flying spot forming device and a design method. Background technique [0002] At present, a flying spot scanning device based on a rotatable shielding mechanism is used for security inspection. The rotatable shielding mechanism is a cylinder with helical gaps on the side wall for the incident and exit of rays. During the rotation of the cylinder, the rays pass through the narrow The slit collimator irradiates the cylinder, and the radiated particles exit through the gap of the helix to form flying spots. The flying spots move at high speed to form scanning lines, and scan the moving object under test. This flying spot scanning device can be used in non-destructive testing, security inspection and other occasions. [0003] figure 1 Shown is a diagram of the operating state of a flying-spot scanning device. A slit collimator 3 is placed between the radiation source 1 ...

AI Technical Summary

Problems solved by technology

[0006] After extensive research and analysis, it was found that based on the figure 2 The flying-spot scanning equipment of the shielding body has the following disadvantages: 1. The entrance groove he and the exit groove h'e' each occupy half of the space of the side wall, and the exit groove h'e' is distributed in the entire height direction of the side wall, and the side wall The tensile performance is poor. In the case of high-speed rotation of the shield, the centrifugal force F=mωr 2 The effect of shielding body will be very easy to deform, and the equipment cannot form flying spots according to the designed trajectory, which will affect the scanning quality; in extreme cases, the shielding body may crack, posing a safety hazard

2. During the rotation of the shielding body, the rays can form flying spots only within the 180-degree range where the incident slot is located, and there is no distribution of incident slots in the remaining 180-degree range, so flying spots cannot be formed, and the scanning efficiency is low

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