Reference Dosimetry and Calibration of Glass Dosimeters for Cs-137 Gamma-rays

Moon, Young Min; Rhee, Dong Joo; Kim, Jung Ki; Kang, Yeong-Rok; Lee, Man Woo; Lim, H.; Jeong, Dong Hyeok

doi:10.14316/pmp.2013.24.3.140

Cited by 4 publications

(4 citation statements)

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“…The NE 2530 chamber has a volume of 30 cm 3 . It was calibrated at the BIPM in 2012 in terms of H* (10). The M-32002 PTW chamber has a volume of 1000 cm 3 , which was used for determining dose rate less than 1 mSv/h.…”

Section: Ambient Dose Equivalent Rate Measurementsmentioning

confidence: 99%

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Development of ¹³⁷Cs irradiation facility for metrological application

Hassan

Esmat

El-Sersy

2017

Int. J. Metrol. Qual. Eng.

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Abstract. In this work, 137 Cs irradiation facility at the National Institute of Standards (NIS) was developed to enhance the calibration processes. Different thickness lead sheets were used for beam attenuation, to enlarge the 137 Cs dose range. Ambient dose equivalent rate, H*(10) was measured using two ionization chambers at a different source-detector distances (SDDs) and a lead sheet thickness. The deviation from the inverse square law for the dose-SDD relationship was obtained. The beam flatness of unattenuated and the lead attenuated beam was measured. The attenuation coefficient for the used lead sheets was obtained and correlated to the broad beam geometry. The room scattering was studied in detail. The uncertainty of the measured doses was calculated. It was found that the inverse square law is verified well at SDD ≥ 2 m. The measured attenuation coefficient for lead attenuators is affected by the broad beam geometry. The contribution of the scattering component of the dose at a certain SDD is the major source of uncertainty since it extracted a value of 1.05%, while the combined uncertainty from all other factors affecting the dose measurements is 1.34%.

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Section: Ambient Dose Equivalent Rate Measurementsmentioning

confidence: 99%

“…According to the recent international protocols, 137 Cs is used as a good beam quality for calibration in the range of radiation protection [6][7][8][9][10]. 137 Cs reference beam at NIS is characterized to be used in survey meter calibrations and other radiation detectors at protection level as well.…”

Section: Introductionmentioning

confidence: 99%

Development of ¹³⁷Cs irradiation facility for metrological application

Hassan

Esmat

El-Sersy

2017

Int. J. Metrol. Qual. Eng.

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“…Many of protocols, which are based on the standards of absorbed radiation dose to water, were recommended by IAEA (Albers, 2008;Bjerke, 2003;IAEA, 2005;IAEAb, 1997;Khan et al, 1991), where water is the only standard and most universal phantom material (reference medium) for proton, light ions, and gamma-ray dosimetry (Casar et al, 2004;Khan et al, 1991;Moon et al, 2013;Vatnitsky, 2008). Moreover, some efforts were conducted to apply water calorimetry for dose measurements of neutron, proton, and low-energy x-ray beams (Ross & Klassen, 1996).…”

Section: Introductionmentioning

confidence: 99%

A possible ɤ- radiation Dosimeter based on the radiation induced changes in Electrical conductivity of water in the presence of silica gel

Sife-Eldeen

2020

Journal of Radiation Research and Applied Sciences

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ɤ-Irradiation induces electrical conductivity (RIC) in water. But, the RIC values of water can be more than twofold higher in the presence of silica gel (SG) with particle size in the range >0.16-0.2 mm, relative to that of water only. Can this phenomenon be used in ɤradiation dosimetry? In order to answer this question, the effects of absorbed dose, absorbed dose rate, and postirradiation storage time, on the RIC, were studied. A linear increase (R 2 = 0.9952) in RIC with the increase in radiation absorbed dose was observed up to 16.24 kGy. Uncertainty type A (95% confidence level) of the measurements of absorbed dose/RIC function was found to be in the range 0.028-0.14. The coefficient of variation (CV%) of the studied system measurements was calculated, which did not exceed 6.53%. The RIC of the irradiated solutions showed good stability during post-irradiation storage (14 days at 0°C storage condition), where the fading of the response after storage was found to be in the range 2.16-3.50%. Moreover, the RIC increases, linearly, as the dose rate decreases (0.28-1.12 kGy/h). The studied dose ranged, of such system, covers dosimetric applications in medical and food irradiation.

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“…In the previous study, the TRS-277 dosimetry protocol has been introduced in Cs-137 beam dosimetry for the calibration of glass dosimeters. 5) However, applying the TRS-277 protocol for Cs-137 dosimetry is limited because the air kerma based chamber calibration factor is not usually practiced nowadays and is complicated process to determine the individual factors for calibration. 6) In addition to that, the effect of waterproof sleeve for wall correction and central electrode correction was not considered in TRS-277.…”

Section: Introductionmentioning

confidence: 99%

Determination of TRS-398 Quality Factors for Cs-137 Gamma Rays in Reference Dosimetry

et al. 2014

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The Cs-137 irradiator is widely used to irradiate biological samples for radiobiological research. To obtain the accurate outcomes, correct measurements of the delivered absorbed dose to a sample is important. The IAEA protocols such as TRS-277 and TRS-398 were recommended for the Cs-137 reference dosimetry. However in TRS-398 protocol, currently known as the most practical dosimetry protocol, the quality factor (   ) for Cs-137 gamma rays is not suggested. Therefore, the use of TRS-398 protocol is currently unavailable for the Cs-137 dosimetry directly. The calculation method previously introduced for high energy photon beams in radiotherapy was used for deriving the Cs-137 beam qualities (   ) for the 15 commercially available farmer type ionization chambers in this study. In conclusion,    values were ranged from 0.998 to 1.002 for Cs-137 gamma rays.These results can be used as the reference and dosimeter calibrations for Cs-137 gamma rays in the future radiobiological researches.

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Reference Dosimetry and Calibration of Glass Dosimeters for Cs-137 Gamma-rays

Cited by 4 publications

References 1 publication

Development of ¹³⁷Cs irradiation facility for metrological application

Development of ¹³⁷Cs irradiation facility for metrological application

A possible ɤ- radiation Dosimeter based on the radiation induced changes in Electrical conductivity of water in the presence of silica gel

Determination of TRS-398 Quality Factors for Cs-137 Gamma Rays in Reference Dosimetry

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Reference Dosimetry and Calibration of Glass Dosimeters for Cs-137 Gamma-rays

Cited by 4 publications

References 1 publication

Development of 137Cs irradiation facility for metrological application

Development of 137Cs irradiation facility for metrological application

A possible ɤ- radiation Dosimeter based on the radiation induced changes in Electrical conductivity of water in the presence of silica gel

Determination of TRS-398 Quality Factors for Cs-137 Gamma Rays in Reference Dosimetry

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Development of ¹³⁷Cs irradiation facility for metrological application

Development of ¹³⁷Cs irradiation facility for metrological application