A radioactive source channel blocked detection device

Abstract

The invention provides a radioactive source channel obstruction detection device, which comprises: a wire guide bracket, a probe bracket, a wire guide tube, a probe, an adjusting nut, and a signal lead-out terminal; The straight section at both ends and the arc section in the middle, the arc section is larger than the diameter of the straight section; the guide wire tube is composed of two sections, each section is fixed to the inner surface of the straight section at both ends of the circular passage; The needle bracket, the probe bracket is provided with a threaded through hole, the threaded through hole communicates with the arc top of the arc section, and the probe is screwed into the threaded through hole through the adjusting nut until the bottom end of the probe is exposed in the arc section and then fixed; The probe is connected to the external control circuit through the signal lead-out terminal; if the wire rope of the radioactive source contacts the bottom of the probe, a ground signal will be generated, and the signal lead-out terminal will transmit the ground signal as a blocked signal to the external control circuit. Once the external control circuit receives the blocked signal The ground becomes a low level, that is, it is judged that the wire rope of the radioactive source is hindered in motion.

Description

technical field [0001] The invention belongs to the technical field of internal irradiation radiotherapy equipment, and in particular relates to a detection device for blocked radiation source channels. Background technique [0002] The radionuclide afterloading treatment machine is based on the optimization plan of the planning system. In the treatment room, the computer remote control is used to transmit the radioactive source to the corresponding residence position in the patient's source tube for radiotherapy. The characteristics of high dose, short range, and rapid drop of peripheral dose can effectively increase the local irradiation dose of tumors and protect surrounding normal tissues and important organs. [0003] In the radioactive source delivery mechanism of the existing radionuclide afterloading therapy machine, the steel wire ropes of the real source and the false source are generally driven by a stepping motor, and enter through the source applicator according...

AI Technical Summary

Problems solved by technology

[0004] 1. The difference between the set total pulse number and the feedback pulse number is a fixed value in the control circuit, which cannot be adjusted according to the situation of different radioactive source wire ropes;

[0005] 2. The difference between the total number of pulses set and the number of feedback pulses can trigger the detection signal only when it accumulates to a certain extent. The sensitivity is low, and the occurrence of obstruction cannot be detected in real time.

Once the channel is blocked, the wire rope of the radioactive source is stuck at the blocked position, and the source storage lead tank cannot be retracted, and the source must be manually collected by the operator, causing radiation damage

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