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Experimental Survey of the Relationship Between Absorbed Dose and the Vertical Position of Samples in a Panoramic Gamma Irradiator
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Experimental Survey of the Relationship Between Absorbed Dose and the Vertical Position of Samples in a Panoramic Gamma Irradiator
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Experimental Survey of the Relationship Between Absorbed Dose and the Vertical Position of Samples in a Panoramic Gamma Irradiator
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Journal Article
Experimental Survey of the Relationship Between Absorbed Dose and the Vertical Position of Samples in a Panoramic Gamma Irradiator
2025
Overview
Objective: This work aims to set up the correlation between height and absorbed dose using commercial acrylic dosimeters, through a mapping of the absorbed dose distribution in a panoramic cobalt-60 gamma irradiator. This study is essential for defining a safe limit for stacking boxes having materials subject to gamma irradiation, aiming to maintain service quality and optimize space in the irradiation chamber. Theoretical Framework: Dosimetry is an important function in radiation processing, where large, absorbed doses and dose rates from photon must be measured with reasonable accuracy. Proper calibration and traceability of routine dosimetry systems to standard are crucial to the success of large-volume radiation processes. It is essential that users perform their own separate calibration for their own instrumentation and conditions of use. Method: The samples to be irradiated is placing in specific positions, the dose value to be received by each sample is known. Four absorbed dose locations were chosen (1, 2, 3, and 5 kGy). Sixty Amber Perspex 3042 dosimeters from the same batch were used to analyze the correlation between height and absorbed dose. The procedure adopted involved calculating an absorbed dose point in the irradiator that delivers a dose of 2.5 kGy and covers a 24-hour irradiation period. After irradiation, the dosimeters were analyzed with a spectrophotometer at 603 nm to obtain absorbance values. Results and Discussion: The results showed that the radiation field remains homogeneous up to a height of 1.60 m, up to 2 m from the Co-60 source. It was concluded that the boxes can be safely positioned up to this height without significant variation in the absorbed dose. To achieve the target dose of 2.5 kGy, it is recommended to adjust the distance between the boxes and the radiation source, allowing the absorbed dose to be optimized without compromising the homogeneity of the radiation field. Research Implications: It was concluded that the boxes can be safely positioned up to heights up to 1.60 m at a distance 2 m from the source, without significant variation in the absorbed dose. To achieve the target dose of 2.5 kGy, it is recommended to adjust the distance between the boxes and the radiation source, allowing the absorbed dose to be optimized without compromising the homogeneity of the radiation field. Originality/Value: This experimental work is important for the quality and reliability of the irradiations performed in this laboratory. Experimental work validates theoretical predictions.
