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Design and development of automated beta irradiation and calibration system: effect of beam flattening filters on dose homogeneity using radiochromic films and angular beta dose dependency on ISO phantoms by measurement and MC simulation
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DOI：10.1093/rpd/ncag031.png)
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Abstract
En 中文
The present study is aimed at investigating dose homogeneity in a reference beta radiation field established for calibration of protection level devices and beta irradiation purposes as well as angular dose responses of the detectors on ISO rod and pillar phantoms. To this end, an automatic electromechanic system for beta irradiation and calibration (BIKS) was designed and manufactured with precise automatic control of the source shutter, stepper motors, detector rotation, and distance using microcontrollers. BIKS system enables to measure angular beta personal dose equivalents for skin-extremity Hp(0.07) and the lens of the eye Hp (3), including the corrections to standard reference conditions by using a multi-sensor. In beta radiation field, 2D spatial dose distributions were measured at 11 cm using radiochromic film dosimetry. Dose homogeneity is obtained better than similar to 91 +/- 5%, on the average. Field uniformity was expanded using filters such as Hostaphan((R)) PET films recommended by ISO 6980-1:2023 and other custom-designed filters. Angular dose responses of the detectors were measured over 0 degrees to +/- 60 degrees angle on ISO rod and pillar phantoms at 11, 20, and 30 cm. The measured differences in Hp(0.07) are <3% for all angles. BIKS system was also modelled using MC-based RayXpert((R)) software. The estimated results are good agreement with those experimental ones.
Keywords:
DOSIMETRY
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