Plastic scintillation optical fiber dosemeter baesd on SiPM leakage current readout

Abstract

The invention discloses a plastic scintillation optical fiber dosemeter based on SiPM leakage current readout. The plastic scintillation optical fiber dosemeter based on the SiPM leakage current readout comprises a shell in which a dark room is formed; a PCB board arranged in the dark room, wherein a readout circuit and a SiPM are arranged on the PCB board, the readout circuit comprises a circuitinput end and a current-limiting resistor, the circuit input end, the current-limiting resistor and the SiPM are serially connected, and the circuit input end is connected with a power supply; an ampere meter arranged at the external of the shell, wherein the input end of the ampere meter is connected with the SiPM, and an output end of the ampere meter is grounded; a plastic scintillation opticalfiber for interacting with the ray to produce visible light; a transmission optical fiber with one end connected with the plastic scintillation optical fiber and the other end penetrating through theshell to connect with the SiPM in the dark room, wherein the transmission optical fiber is used for transmitting visible light. The SiPM is used as the photoelectric conversion element, the SiPM hasthe advantages of being small in volume and hard to be interfered by the electromagnetism; and the usage range of the plastic scintillation optical fiber dosemeter is enlarged. The actual radiation dosage can be obtained by reading the SiPM leakage current to compare with a dosage response curve calibrated by a laboratory.

Description

Technical field [0001] The invention relates to the technical field of plastic scintillation optical fiber dosimeters, in particular to a plastic scintillation optical fiber dosimeter based on SiPM leakage current reading. Background technique [0002] As one of the main methods of tumor treatment, radiotherapy technology has been developing towards high accuracy and high precision in recent years. To achieve the above goals, various dosimeters have been proposed and applied to quality assurance (QA). The plastic scintillation fiber dosimeter has good tissue equivalence, good linearity, good energy response and high spatial resolution (the volume can be less than 1mm 3 ), the advantages of good repeatability and long-term stability have received widespread attention in the field of radiotherapy dose. At present, plastic scintillation fiber dosimeters mostly use a dose readout method based on the pulse integration of a photoelectric conversion device. This readout method requires...

AI Technical Summary

Problems solved by technology

At present, plastic scintillation fiber optic dosimeters mostly use the dose readout method based on the pulse integration of photoelectric conversion devices. This readout method requires the design of a special electronic readout system, and this readout method cannot be used for brachytherapy and continuous beam dose. Measurement

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