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Abstrakty
In this work attempts have been made to investigate the variation of polystyrene calorimeter response after frequent irradiations with an electron beam. Polystyrene calorimeters are routinely used in every radiation processing center as a traceable to NPL primary standard dosimeter. Thus, self designed high impact polystyrene as the calorimeter core was irradiated several times up to many thousands of kGy doses. After each irradiation, the specific heat capacity of the polystyrene as the main changeable parameter was measured using the differential scanning calorimeter system (DSC) in the practical temperature range of polystyrene calorimeter. Therefore, correction factors to calculate the precise absorbed dose were obtained. At the final stage, several these calorimeters were irradiated simultaneously along with two Risoe standard calorimeters and another correction factor for each tested calorimeter was calculated.
Czasopismo
Rocznik
Tom
Strony
175--178
Opis fizyczny
Bibliogr. 13 poz., rys.
Twórcy
autor
autor
- Material and Ion Beam Application Division, Nuclear Research Center for Agriculture and Medicine, P. O. Box 31485-498, Karaj, Iran and Yazd Radiation Processing Center, P. O. Box 89175-389, Yazd, Iran, Tel.: +98 261 4411100, Fax: +98 261 4464056, fziaie@yahoo.com
Bibliografia
- 1. ASTM (1992) Standard practice temperature calibration of differential scanning calorimeters and differential thermal analyzers. ASTM E 967
- 2. ASTM (1995) Standard practice for use of calorimetric dosimetry systems for electron beam dose measurements and dosimeter calibrations. ASTM E 1631
- 3. ASTM (1995) Standard test method for determining specific heat capacity by differential scanning calorimetry.ASTM E 1269
- 4. Fielden EM, Holm NW (1970) Dosimetry in accelerator research and processing. In: Holm NW, Berry RJ (eds) Manual of radiation dosimetry. Marcel Dekker, New York, pp 297−300
- 5. Humphreys JC, McLaughlin WL (1990) Calorimetry of electron beams and the calibration of dosimeters at high doses. Radiat Phys Chem 35:744−749
- 6. Icre P (1983) Industrial dosimetric controls of ionizing treatments by electron beam. J Indust Irradiation Tech 1:163−178
- 7. Janovsky I (1985) Dosimetry methods applied to irradiation with Tesla-4 MeV linear electron accelerators.In: High-dose dosimetry. IAEA, Vienna, pp 307−316
- 8. McLaughlin WL, Boyd AW, Chadwick KH, McDonald JC, Miller A (1989) Dosimetry for radiation processing.Taylor and Francis, London
- 9. Miller A, Kovacs A (1985) Calorimetry at industrial electron accelerators. Nucl Instrum Methods Phys Res B 10/11:994−997
- 10. Miller A, Kovacs A (1990) Application of calorimeters for routine and reference dosimetry at 4−10 MeV industrial electron accelerators. Radiat Phys Chem 33:774−778
- 11. Panta PP, Bulhak Z (1985) Statistical and metrological aspects of 20 years experience of radiation processing in Poland. In: High-dose dosimetry. IAEA, Vienna,pp 47−60
- 12. Risø National Laboratory (1996) Absorbed dose measurement with graphite calorimeters. In: Quality manual, QC 2422-1.4, 4th ed. Risø National Laboratory,Denmark, pp 1−4
- 13. Ziaie F, Afarideh H, Hadji-Saeid SM, Durrani SA (2001)Investigation of beam uniformity in industrial electron accelerator. Radiat Meas 34:609−613
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ5-0003-0009