| abstract |
The invention relates to a variable-focus gamma camera based on a MURA coding method, belonging to the technical field of radiation detection. The gamma camera comprises a coding code board, an array-type position-sensitive detector, a coding code board and an array-type position-sensitive detector. The centers of the arrays are relatively set on the same axis, and the distance between them is adjustable; the gamma rays emitted by the radioactive source are modulated by the encoding plate to form an image about the encoding plate on the detector; the rear end of the detector is connected to a multi-channel Data acquisition card, multi-channel data acquisition card converts the pulse signal generated by each crystal strip in the detector into a digital signal, and transmits the signal to the upper computer software, the upper computer software performs image reconstruction, and obtains the distribution image of the radioactive source . The gamma camera provided by the invention can realize the accurate measurement and imaging of the location of the gamma radiation hot spot of the nuclear facility, and realize the radionuclide activity distribution measurement of the radiation hot spot such as pipelines, valves and containers. |