1. bookVolume 61 (2016): Issue 1 (March 2016)
Journal Details
License
Format
Journal
eISSN
1508-5791
First Published
25 Mar 2014
Publication timeframe
4 times per year
Languages
English
Open Access

Application of the Böhm chamber for reference beta dose measurements and the calibration of personal dosimeters

Published Online: 17 Mar 2016
Volume & Issue: Volume 61 (2016) - Issue 1 (March 2016)
Page range: 61 - 67
Received: 20 Jan 2015
Accepted: 16 Nov 2015
Journal Details
License
Format
Journal
eISSN
1508-5791
First Published
25 Mar 2014
Publication timeframe
4 times per year
Languages
English
Abstract

Thermoluminescent dosimeters (TLDs) currently used in personal and area dosimetry are often utilized to measure doses of ionizing radiation in fields with a more complex structure and therefore they should be calibrated in relation to different radiation types. The results of such calibration presented for UD-813 TLDs allowed for evaluation of their capability in relation to different radiation types like the beta and photon radiation of different energies and neutron radiation generated by the 241Am-Be source. The detector response for 60 keV photons was 10% higher than for the 662 keV gamma radiation of 137Cs. There were also response differences in relation to photon and beta radiation between detectors with an enhanced concentration of lithium 6Li and boron 10B and detectors containing a natural level of these isotopes. Measurements of the reference beta doses were performed with the help of the Böhm chamber. This method is relatively more complicated compared to determining the reference photon and neutron doses and is described thoroughly in this paper. The corrected current measured by the Böhm chamber for the chosen parameters was a linear function for an entire available range of the chamber depths. The percentage of errors related to the evaluated reference beta doses were below 2% despite a rather large number of corrections that should be taken into account. The calibration distances varied from 11 cm to 50 cm. For this range and beta particle energy, the absorption of radiation in the air was negligible and their attenuation had a predominantly geometric character.

Keywords

1. Skubacz, K. (2015). Measurements of low doses with Panasonic dosimeters. Algorithm and tests. Radiat. Meas., 75, 9–14. DOI: 10.1016/j.radmeas.2015.02.020.10.1016/j.radmeas.2015.02.020Search in Google Scholar

2. International Organization for Standardization. (1996). X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy – Part 1: Radiation characteristics and production methods. ISO 4037-1-1996. Geneva.Search in Google Scholar

3. Piesch, E., & Burgkhardt, B. (1988a). Albedo dosimetry system for routine personnel monitoring. Radiat. Prot. Dosim., 23(1/4), 117–120.10.1093/oxfordjournals.rpd.a080142Search in Google Scholar

4. Olko, P., Currivan, L., Van Dijk, J. W. E., Lopez, M. A., & Wernli, C. (2006). Thermoluminescence detectors applied in individual monitoring of radiation workers in Europe – a review based on the EURADOS questionnaire. Radiat. Prot. Dosim., 120(1/4), 298–302. DOI: 10.1093/rpd/nci538.10.1093/rpd/nci538Search in Google Scholar

5. Rivera, T. (2012). Thermoluminescence in medical dosimetry. Appl. Radiat. Isot., 71, 30–34. DOI: 10.1016/j.apradiso.2012.04.018.10.1016/j.apradiso.2012.04.018Search in Google Scholar

6. Piesch, E., & Burgkhardt, B. (1988b). Field calibration technique for albedo neutron dosemeters. Radiat. Prot. Dosim., 23(1/4), 121–126.10.1093/oxfordjournals.rpd.a080143Search in Google Scholar

7. Olko, P. (2010). Advantages and disadvantages of luminescence dosimetry. Radiat. Meas., 45(3/6), 506–511. DOI: 10.1016/j.radmeas.2010.01.016.10.1016/j.radmeas.2010.01.016Search in Google Scholar

8. Budzanowski, M., & Burgkhardt, B. (1995). Thin 6/7LiF’Mg,Cu,P and 6/7LiF:Mg,Ti detectors for automatic albedo neutron dosimetry. Radiat. Meas., 24(4), 445–448. DOI: 10.1016/1350-4487(95)00015-7.10.1016/1350-4487(95)00015-7Search in Google Scholar

9. International Organization for Standardization. (2004). Nuclear energy – Reference beta-particle radiation – Part 2: Calibration fundamentals related to basic quantities characterizing the radiation field. ISO 6980-2:2004. Geneva.Search in Google Scholar

10. International Commission on Radiation Units and Measurements. (1998). Conversion coefficients for use in radiological protection against external radiation. Bethesda: ICRU. (Report 57).Search in Google Scholar

11. Böhm, J. (1986). The national primary standard of the PTB for realizing the unit of the absorbed dose rate to tissue for beta radiation. Braunschweig: Physikalish-Technische Bundesanstalt. (PTB-Dos-13).Search in Google Scholar

12. Urban, P., & Skubacz, K. (2013). Large-scale system for dosimetric measurements in industry and medicine. Zeszyty Naukowe WSZOP, 1(9), 68–82.Search in Google Scholar

Recommended articles from Trend MD

Plan your remote conference with Sciendo