Development of a parallel plate monitor chamber for the dosimetry of a 6 MeV filiform electron beam

F. LEYTON; J. LEIVA; J. GUARDA; J. VELÁSQUEZ; M. VALENTE; F. MALANO; R. FIGUEROA

Zacatecas

Congreso; ISSSD 2021 - Int. Symposium of Solid State Dosimetry; 2021

Univ. Zacatecas & Soc. Mex de Dosim.

One of the main causes of radiation exposure of the population generated by artificial sources is due to medical practice [1]. In this sense, the use of radiation detectors is essential for the detection, optimization of procedures, radiation monitoring, prevention and alerts for the safety use of radiation. The purpose of this work is to design and develop a parallel plate monitoring chamber aimed at dosimetry purposes for by a clinical LINAC which was intervened to produce a 6 MeV filiform electron beam, which cannot be disturbed by the materials of the monitoring chamber. Hence, the proposed monitoring chamber consists of three 0.02 cm thick plates covered by a thin conductive layer of graphite. The plates have a central 0.5 cm diameter hole to allow the pass of the electron beam through the chamber avoiding radiation collisions, but ionizing the air contained within the two sensitive volumes, each 47 cm3 and 0.5 cm thickness. The chamber records the electrical charge, absorbed dose and dose rates. The chamber characterization tests [2]: Saturation Curve, Ion Collection Efficiency, Polarity Effect, Linearity of Response and Energy Dependence will be done and intercompare respect to the reference chamber. Preliminary results show that the proposed novel monitor chamber design is capable of satisfying the required standards for 6 MeV electron beam dosimetry suggesting that this parallel plate monitoring chamber may be used for further developments of convergent beam radiotherapy CONVERAY device.