Blocking detection device of radioactive source channel

Abstract

The invention provides a blocking detection device of a radioactive source channel. The blocking detection device comprises a lead wire bracket, a probe bracket, a lead wire pipe, a probe, an adjusting nut and a signal leading-out terminal, wherein a round channel is formed in the lead wire bracket; the round channel is composed of straight sections at the two ends and an arc-shaped section in the middle; the arc-shaped section is greater than the diameter of each straight section; the guide wire pipe is composed of two sections and each section is fixedly connected with the inner surfaces of the straight sections at the two ends of the round channel; the probe bracket is arranged on the top of the lead wire bracket; the probe bracket is provided with a thread through hole and the thread through hole is communicated with the arc top of the arc-shaped section; the probe is screwed into the thread through hole by the adjusting nut until the bottom end of the probe is exposed in the arc-shaped section and then is fixed; the probe is connected with an external control circuit through the signal leading-out terminal; if a radioactive source steel wire rope is in contact with the bottom end of the probe to generate a grounding signal, the signal leading-out terminal takes the grounding signal as a blocking signal to be transmitted to the external control circuit; and once if the external control circuit receives the blocking signal and is grounded to form a low electric level, the radioactive source steel wire rope is judged to be blocked in a movement process.

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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