A portable β-ray irradiator for on-site calibration of photoluminescent dosimeters

Abstract

The invention belongs to the technical field of ionizing radiation dose monitoring, and in particular relates to a portable β-ray irradiator for on-site calibration of a photofluorescence dosimeter, which is used for irradiating an OSLD. The OSLD is a photofluorescence dosimeter, including a straight plate The bracket with the transmission window is opposite to the annular shielding body and the shielding plate arranged on the two sides of the bracket, the transmission window is located between the annular shielding body and the shielding plate, and the radioactive source bracket is arranged in the annular shielding body. There is a radioactive source, an irradiation chamber is arranged between the shielding plate and the transmission window, a shutter is arranged between the transmission window and the irradiation chamber, and a sample tray for transporting OSLD to the irradiation chamber is also included. The invention can be easily carried to the site to calibrate the OSLD; radioactive sources of different types and activities can be replaced at any time according to actual needs, increasing the scope of application; an electrodeposition planar source with controllable active area is designed to make the irradiation chamber The direction of the ray tends to be collimated, which improves the uniformity of the dose rate of the irradiation chamber.

Description

technical field [0001] The invention belongs to the technical field of ionizing radiation dose monitoring, and in particular relates to a portable beta ray irradiator for on-site calibration of photoluminescent dosimeters. Background technique [0002] Photoluminescence dosimeter (OSLD) has become an excellent personal dosimeter due to its advantages of stable signal, high sensitivity, wide range and repeatable measurement. It has been widely used in environmental, medical and space radiation monitoring and other fields. In order to ensure the accuracy of dose monitoring, it is necessary to calibrate the photoluminescent dosimeter before use. The common calibration method is: the unit using the dosimeter sends the dosimeter to the testing unit, and the testing unit irradiates it with a standard radiation field. The reading is performed by the unit of use, and the calibration correction is performed by the difference between the reading value and the reference value. [0003...

AI Technical Summary

Problems solved by technology

[0003] However, for special environments such as radiation dose monitoring during the long-term operation of the space station, personal dose monitoring during nuclear-powered ocean-going missions, and dose monitoring in nuclear emergency situations, OSLDs and their readout devices for personal or environmental monitoring need to accompany them for a long time, and it is difficult to monitor them in a timely manner. The laboratory performs calibration, and the reliability of its monitoring value is difficult to be guaranteed

Images