Measurement of the absolute value of exposition of the dose on the betatron B-25
DOI:
https://doi.org/10.24144/2415-8038.2017.42.196-201Keywords:
Betatron, Passage chamber, Absolute chamber, Target, Calibration, Intensity, X-ray doseAbstract
Radiobiological research, treatment of malignant tumors, acceleration of chemical processes, study of radiation defects, metal defectoscopy are some main problems requiring radiation exposure. In this regard, the primary task for accelerators of charged particles is to determine the dose of radiation. Among the many types of charged particle accelerators for scientific and practical purposes, an induction electronic accelerator plays a special role. In betatron, an electric field is used to accelerate electrons in a circular orbit, the intensity of which is replaced by a magnetic flux.
This article proposes one of the methods for measuring the expositional dose during operation of betatron B-25. In order to control the beam of bremsstrahlung, a passage ionization chamber, an absolute ionization chamber, two ball cameras of the clinical dosimeter RTF27012 are used in the experiment. The passage camera's values are proportional to the expositional dose, and the ball camera's values are proportional to the intensity of the electron beam. The ball cameras are independently calibrated with standard reference sources of beta particles and gamma quanta (complete of clinical dosimeter). A table of calibration of particles passing through the passage chamber and an absolute accelerator chamber is created. The value of the expositional dose in the experiment is obtained.
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