Evaluation using Geant4 of the transit dose in the Tunisian gamma irradiator for insect sterilization

Mannai, K.; Askri, Boubaker; Loussaief, A.; Trabelsi, A.

doi:10.1016/j.apradiso.2007.01.011

Cited by 13 publications

(2 citation statements)

References 9 publications

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“…Although this method has the disadvantage of high nominal prices and takes a long time, its results are close to the actual ones. When using computation, the Monte-Carlo method is the most widely used [7].…”

Section: Theorymentioning

confidence: 99%

Intercomparison of Gamma Cell 220 Irradiator Facilities and Dr. Mirzan T Razzak Gamma Irradiators Using Harwell Dosimeters

Saputro

2021

jfn

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The gamma irradiator is a multi-purpose facility that possibly used to preserve food, sterilize medical equipment, and conduct genetic engineering and polymerization processes, during which the absorbed dose of the product is critical. The standardization of product quality assurance was regulated by the IAEA Technical Document Number 409 considering Dosimetry for Food Irradiation and ISO 14470 and 11137-3 on Food Irradiation, as well as the Guidance on Dosimetric Aspects of Development, Validation, and Routine Control, respectively. The absorbed dose was influenced by the movement of the product to the source, its position, the amount of radioactive activity in the facility, and the dose rate in the irradiation room. The dosimeter performance test and quality assurance of the system were conducted using the Facility Intercomparison Technique which tested the dosimeter (measuring instrument) at 2 different facilities to determine the performance of the measuring instrument.. In this study, 2 irradiation facilities were tested using a Harwell routine dosimeter in the dose range of 1 kGy to 30 kGy and 20 dose points. The results showed that the highest deviation reached 19% and 21% at the Gamma Cell 220 and the Dr. Mirzan T Razzak Gamma irradiator facilities. This elevated the performance of the dosimeters to determine the precision accuracy of the dose-measuring instrument.

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Section: Theorymentioning

confidence: 99%

Intercomparison of Gamma Cell 220 Irradiator Facilities and Dr. Mirzan T Razzak Gamma Irradiators Using Harwell Dosimeters

Saputro

2021

jfn

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“…Depending on the irradiator design, the transit dose due to the radioactive source movement (or the product itself) until the stable irradiation position might affect the predicted absorbed dose. The contribution of the transit dose is usually neglected in most routine processes covering doses of tens kGy [1,2], but it is likely to be significant to low-dose processes. This dosimetric issue also arises in intensitymodulated radiation therapy (IMRT) [3,4] and high dose rate (HDR) brachytherapy [5,6], generally associated with the displacement of the source between the dwell irradiation positions.…”

Section: Introductionmentioning

confidence: 99%

Transit dose measurements using alanine and diode-based dosimeters

Gonçalves

Somessari

et al. 2022

Braz. J. Rad. Sci.

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The growing interest in low-dose (< 100 Gy) radiation processing applications has raised concerns about accurately measuring the absorbed dose in irradiated materials. Depending on the irradiator design, the transit time due to the radioactive source movement (or the product itself) until the stable irradiation position might affect the predicted absorbed dose. This work aims to evaluate the transit dose in a 60Co Gammacell 220-Nordion irradiator, which has radioactive sources settled at the bottom of a lead shielding. When the facility is on, the product and the dosimeter are mechanically guided down to the irradiation position, and hereafter the selected exposure time starts to be counted. At the end of irradiation, both product and dosimeter rise to the initial position enabling them to be gathered by the operator. The product is continuously irradiated at different dose rates during its fall and rise movement, preventing the transit dose from being obtained straightforward. The experimental approach adopted is to assess the transit time, and thus the transit dose, using an online diode-based dosimetry system previously calibrated against reference standard alanine dosimeters. The agreement between the transit doses attained with the diode (0.41 ± 0.02) Gy and alanine ((0.38 ± 0.01) Gy validates the method herein proposed.

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