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APV Provincial Secretariat for Science of the Republic of Serbia [114-451-3583]

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Quality control in radiation processing in the Vinča Institute Radiation Plant: Case study

Šećerov, Bojana; Stančov, Danijela; Radenković, Mirjana; Dramićanin, Miroslav

(2016)

TY  - JOUR
AU  - Šećerov, Bojana
AU  - Stančov, Danijela
AU  - Radenković, Mirjana
AU  - Dramićanin, Miroslav
PY  - 2016
UR  - http://casopisi.junis.ni.ac.rs/index.php/FUPhysChemTech/article/view/1535
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7627
AB  - The irradiation process control has to define facility parameters, validation of product and routine control of the irradiation process during exploitation. To meet the regulations, it is necessary to stop the exploitation and do the qualification exercises after changes in the source loading, source geometry or product transport system. In order to save time, the new combined approach has been analyzed for qualification of sterilization process used in the Vinča Institute Radiation Plant. The absorbed dose is calculated assuming that the irradiation process runs with specified parameters. The results of absorbed dose measurements in an experiment done during the sterilization process were used for dose calculations. The calculated absorbed doses are compared with measured ones. The criterion for a positive qualification is the superposition of calculated and measured values. Two different types of dosimeters are used for measurements: ethanol-chlorobenzene and alanine. The measurement traceability is achieved through the calibration by the Riso National Laboratory, Denmark. In this case study, the determined dwell time for target dose is 450s. 1.23 is dose uniformity ratio in the box with plastic products with dose minimum at the bottom corners in the center and dose maximum at the top of the surface plane of the box parallel to the source. The calculated and measured absorbed doses show the same difference of 13% between the surface and the central plane in the box. The dose reproducibility for irradiation process is 3.5%.
AB  - Kontrola procesa ozračivanja mora da definiše parametre postrojenja, validaciju proizvoda i rutinsku kontrolu procesa tokom eksploatacije. Da bi se ispunili zahteve propisa, neophodno je prekinuti eksploataciju i uraditi kvalifikaciju procesa ozračivanja posle svake dopune izvora, promene geometrije izvora ili transportnog sistema. U cilju uštede vremena, analiziran je novi kombinovani pristup kvalifikacije procesa sterilizacije u Radijacionoj jedinici Instituta 'Vinča'. Apsorbovana doza je izračunavana pretpostavljajući da proces teče po zadatim parametrima. Za izračunavanje koriste se rezultati merenja apsorbovane doze u eksperimentu koji je izveden u toku procesa sterilizacije. Izračunate apsorbovane doze upoređuju se sa izmerenim. Kriterijum za pozitivnu kvalifikaciju procesa je slaganje izračunatih i izmerenih vrednosti. Za merenja su korišćena dva tipa dozimetara: etanol-hlorbenzen i alanin. Merna sledljivost je postignuta preko kalibracije u RISO nacionalnoj laboratoriji u Danskoj. U ovoj studiji, određena je dužina koraka za ciljanu dozu od 450s. 1,23 je odnos homogenosti doze u kutiji sa plastičnim proizvodima, sa minimumom doze u donjim uglovima centralne ravni i maksimalnom dozom na vrhu ivice kutije u ravni paralelnoj sa izvorom. Izračunate i izmerene apsorbovane doze pokazuju istu razliku od 13% između površinske i centralne ravni kutije. Reproduktivnost doze za proces ozračivanja je 3,5%.
T2  - Facta universitatis - series: Physics, Chemistry and Technology
T1  - Quality control in radiation processing in the Vinča Institute Radiation Plant: Case study
T1  - Kontrola kvaliteta u tehnologiji obrade zračenjem - studija slučaja Radijacione jedinice u Institutu 'Vinča'
VL  - 14
IS  - 2
SP  - 105
EP  - 113
DO  - 10.2298/FUPCT1602105S
ER  - 
@article{
author = "Šećerov, Bojana and Stančov, Danijela and Radenković, Mirjana and Dramićanin, Miroslav",
year = "2016",
url = "http://casopisi.junis.ni.ac.rs/index.php/FUPhysChemTech/article/view/1535, http://vinar.vin.bg.ac.rs/handle/123456789/7627",
abstract = "The irradiation process control has to define facility parameters, validation of product and routine control of the irradiation process during exploitation. To meet the regulations, it is necessary to stop the exploitation and do the qualification exercises after changes in the source loading, source geometry or product transport system. In order to save time, the new combined approach has been analyzed for qualification of sterilization process used in the Vinča Institute Radiation Plant. The absorbed dose is calculated assuming that the irradiation process runs with specified parameters. The results of absorbed dose measurements in an experiment done during the sterilization process were used for dose calculations. The calculated absorbed doses are compared with measured ones. The criterion for a positive qualification is the superposition of calculated and measured values. Two different types of dosimeters are used for measurements: ethanol-chlorobenzene and alanine. The measurement traceability is achieved through the calibration by the Riso National Laboratory, Denmark. In this case study, the determined dwell time for target dose is 450s. 1.23 is dose uniformity ratio in the box with plastic products with dose minimum at the bottom corners in the center and dose maximum at the top of the surface plane of the box parallel to the source. The calculated and measured absorbed doses show the same difference of 13% between the surface and the central plane in the box. The dose reproducibility for irradiation process is 3.5%., Kontrola procesa ozračivanja mora da definiše parametre postrojenja, validaciju proizvoda i rutinsku kontrolu procesa tokom eksploatacije. Da bi se ispunili zahteve propisa, neophodno je prekinuti eksploataciju i uraditi kvalifikaciju procesa ozračivanja posle svake dopune izvora, promene geometrije izvora ili transportnog sistema. U cilju uštede vremena, analiziran je novi kombinovani pristup kvalifikacije procesa sterilizacije u Radijacionoj jedinici Instituta 'Vinča'. Apsorbovana doza je izračunavana pretpostavljajući da proces teče po zadatim parametrima. Za izračunavanje koriste se rezultati merenja apsorbovane doze u eksperimentu koji je izveden u toku procesa sterilizacije. Izračunate apsorbovane doze upoređuju se sa izmerenim. Kriterijum za pozitivnu kvalifikaciju procesa je slaganje izračunatih i izmerenih vrednosti. Za merenja su korišćena dva tipa dozimetara: etanol-hlorbenzen i alanin. Merna sledljivost je postignuta preko kalibracije u RISO nacionalnoj laboratoriji u Danskoj. U ovoj studiji, određena je dužina koraka za ciljanu dozu od 450s. 1,23 je odnos homogenosti doze u kutiji sa plastičnim proizvodima, sa minimumom doze u donjim uglovima centralne ravni i maksimalnom dozom na vrhu ivice kutije u ravni paralelnoj sa izvorom. Izračunate i izmerene apsorbovane doze pokazuju istu razliku od 13% između površinske i centralne ravni kutije. Reproduktivnost doze za proces ozračivanja je 3,5%.",
journal = "Facta universitatis - series: Physics, Chemistry and Technology",
title = "Quality control in radiation processing in the Vinča Institute Radiation Plant: Case study, Kontrola kvaliteta u tehnologiji obrade zračenjem - studija slučaja Radijacione jedinice u Institutu 'Vinča'",
volume = "14",
number = "2",
pages = "105-113",
doi = "10.2298/FUPCT1602105S"
}
Šećerov, B., Stančov, D., Radenković, M.,& Dramićanin, M. (2016). Kontrola kvaliteta u tehnologiji obrade zračenjem - studija slučaja Radijacione jedinice u Institutu 'Vinča'.
Facta universitatis - series: Physics, Chemistry and Technology, 14(2), 105-113.
https://doi.org/10.2298/FUPCT1602105S
Šećerov B, Stančov D, Radenković M, Dramićanin M. Kontrola kvaliteta u tehnologiji obrade zračenjem - studija slučaja Radijacione jedinice u Institutu 'Vinča'. Facta universitatis - series: Physics, Chemistry and Technology. 2016;14(2):105-113
Šećerov Bojana, Stančov Danijela, Radenković Mirjana, Dramićanin Miroslav, "Kontrola kvaliteta u tehnologiji obrade zračenjem - studija slučaja Radijacione jedinice u Institutu 'Vinča'" Facta universitatis - series: Physics, Chemistry and Technology, 14, no. 2 (2016):105-113,
https://doi.org/10.2298/FUPCT1602105S .

Estimation of Absorbed Dose During Process Interruption in Radiation Processing

Šećerov, Bojana Lj.; Dramićanin, Miroslav

(2015)

TY  - CONF
AU  - Šećerov, Bojana Lj.
AU  - Dramićanin, Miroslav
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7122
AB  - The quality control system enables the standardization of product quality. Dosimetry has an important role in the quality control of radiation processing. The area of radiation processing which is governed most strictly by regulations is radiation sterilization. This process is used as the example to describe the new method for establishing the effect of process interruption on absorbed dose in the Co-60 irradiation plant at the Vinca Institute of Nuclear Sciences. Establishing the effect of process interruption is one of requirements in international regulations, but there are no recommendations for its implementation. A new method has been worked out by graphical extrapolation. The advantage of this method is the ability to carry it out during the sterilization process. The ethanol-chlorobenzene (ECB) dosimeter is used to select the suitable place where absorbed dose is expected to be the most influenced by source transit, i.e. the most close to the source. In the same time, it should be convenient and reproducible for placing dosimeters. Alanine dosimeters were irradiated on this place in time intervals: 2 min., 4 min., 6 min., 8 min., 10 min. Measurements of time starts when the button to lift source is pressed and stops by pressing the button for process interruption (to sink source down). The absorbed doses were measured by ESR spectrometer. The function of absorbed dose versus irradiation time is linear as expected. The extrapolation back to zero time gives the maximal absorbed dose that can be delivered to product during source transit. In our experiment this absorbed dose obtained by this method is 154 Gy.
C3  - RAD Conference Proceedings
T1  - Estimation of Absorbed Dose During Process Interruption in Radiation Processing
SP  - 181
EP  - 184
ER  - 
@conference{
author = "Šećerov, Bojana Lj. and Dramićanin, Miroslav",
year = "2015",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/7122",
abstract = "The quality control system enables the standardization of product quality. Dosimetry has an important role in the quality control of radiation processing. The area of radiation processing which is governed most strictly by regulations is radiation sterilization. This process is used as the example to describe the new method for establishing the effect of process interruption on absorbed dose in the Co-60 irradiation plant at the Vinca Institute of Nuclear Sciences. Establishing the effect of process interruption is one of requirements in international regulations, but there are no recommendations for its implementation. A new method has been worked out by graphical extrapolation. The advantage of this method is the ability to carry it out during the sterilization process. The ethanol-chlorobenzene (ECB) dosimeter is used to select the suitable place where absorbed dose is expected to be the most influenced by source transit, i.e. the most close to the source. In the same time, it should be convenient and reproducible for placing dosimeters. Alanine dosimeters were irradiated on this place in time intervals: 2 min., 4 min., 6 min., 8 min., 10 min. Measurements of time starts when the button to lift source is pressed and stops by pressing the button for process interruption (to sink source down). The absorbed doses were measured by ESR spectrometer. The function of absorbed dose versus irradiation time is linear as expected. The extrapolation back to zero time gives the maximal absorbed dose that can be delivered to product during source transit. In our experiment this absorbed dose obtained by this method is 154 Gy.",
journal = "RAD Conference Proceedings",
title = "Estimation of Absorbed Dose During Process Interruption in Radiation Processing",
pages = "181-184"
}
Šećerov, B. Lj.,& Dramićanin, M. (2015). Estimation of Absorbed Dose During Process Interruption in Radiation Processing.
RAD Conference Proceedings, 181-184.
Šećerov BL, Dramićanin M. Estimation of Absorbed Dose During Process Interruption in Radiation Processing. RAD Conference Proceedings. 2015;:181-184
Šećerov Bojana Lj., Dramićanin Miroslav, "Estimation of Absorbed Dose During Process Interruption in Radiation Processing" RAD Conference Proceedings (2015):181-184