Radioactive source detector and searching method thereof

Abstract

The invention discloses a radioactive source detector which comprises a shell, a circuit board in the shell, and a rechargeable battery which supplies power to the circuit board. A G-M counter, a GPS positioning module, a data processing module, an RFID shortwave communication module, a GSM wireless communication module, an RS485 communication module and a power supply management module are integrated in the circuit board. The searching method of the radioactive source detector comprises the steps that (1) the radioactive source detector is installed on a radioactive source storage tank, (2) the radioactive source detector sends information to other electrical equipment through an RS485 serial port, (3) the radioactive source detector sends an RFID signal to the periphery and receives a feedback signal at the same time, (4) after loss, the radioactive source detector sends an RFID signal to the periphery and searches the feedback signal sent by other radio equipment, and sends data to a monitoring center at the same time. According to the radioactive source detector and the searching method, the positioning speed and accuracy of a lost radioactive source can be improved, and thus the harm to an environment and a human body by the loss of the radioactive source is reduced.

Description

technical field [0001] The invention relates to the technical field of detectors, in particular to a radiation source detector and a method for finding it after it is lost. Background technique [0002] In recent years, with the development of science and technology, the application of radioactive sources in industry, agriculture, scientific research and other fields has become more and more extensive. However, there are more and more radiation accidents caused by the loss of radioactive sources, especially the loss and leakage during transportation, which have brought great harm to the society. [0003] At present, the search and positioning of lost radioactive sources is generally carried out through the GPS positioning module of the radioactive source detector, and then a blanket search is carried out in the located area. However, the location obtained by the GPS positioning module is not necessarily accurate. For example, the location of the device is in a tunnel or a h...

AI Technical Summary

Problems solved by technology

If the positioning accuracy of the radiation source detector and other wireless devices are R1 and R2 respectively, then the actual straight-line distance L should be within this range L0-R1-R2<L<L0+R1+R2, if the device is located If the location is good, R1 and R2 may be very small (1-5 meters), which will basically not affect our determination of the location of the radioactive source; but if the location of the equipment is not good, R1 and R2 may be very large (hundreds to several km), which results in a larger search range, time-consuming and laborious, low search accuracy, slow search speed, and greater blindness, which reduces the efficiency of locating lost radioactive sources and increases the number of lost radioactive sources that are not in a protected state. Hazards to the environment and people

[0004] Moreover, the repeatability of GPS positioning is not high, and there will be differences in the data between the two positionings. If the time span of the two positionings is relatively large, although on some devices, such as mobile phones, GPS positioning is always on. Yes, through the filtering algorithm, the accuracy of positioning can be guaranteed; however, due to the limitations of battery power and filtering algorithm of our radioactive source detector, if the lost radioactive source detector is always in working condition, the power supply will be greatly reduced. The working time is long, thereby shortening the working time of the radioactive source detector. If it cannot be found as soon as possible within the working time of the radioactive source detector, it will further increase the difficulty of searching

Images