Naslov
Intercomparison of dosimetry systems based on CaF2:Mn TL detectors

Autori
Zorko, Benjamin ; Štuhec, Matjaž ; Gobec, Sandi ; Miljanić, Saveta ; Vekić, Branko ; Ranogajec-Komor, Maria

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, stručni

Izvornik
IRPA 11 Abstracts / - Madrid, 2004, 152-152

Skup
11th International Congress of the International Radiation Protection Association

Mjesto i datum
Madrid, Španjolska, 23.05.2004. - 28.05.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
TL detectors; CaF2:Mn; intercomparison

Sažetak
The aim of the present work was to compare the dosimetry systems based on the same type of thermoluminescence (TL) detectors, used in "Jožef Stefan Institute" (JSI) Ljubljana, Slovenia and "Ruđer Bošković Institute" (RBI), Zagreb, Croatia. The doses were collected by the detectors, CaF2:Mn, which were placed in different holders in different badges. Badges were sticked on the ISO water slab phantom with PMMA walls (dimensions: 30 cm x 30 cm x 15 cm). The doses were measured by two types of readers: TOLEDO 654 (Vinten) reader in RBI and home made reader MR 200 C in JSI. All types of the samples were irradiated at the same time at RBI (or JSI). After irradiation, samples were divided into two equal groups and the doses were read after at least one day at the RBI and JSI. Detectors were irradiated by 137Cs and 60Co sources in two different ranges of doses: a) The doses of interest in accordance with the radiation protection measures were from 0.1 mSv to 10 mSv. The irradiations were performed at 137Cs source in JSI ; b) The doses of interest in the case of the radiation accidents and also for the radiation therapy were up to 5 Gy. These irradiations were performed at 60Co source at RBI ; Control samples held at the same conditions as irradiated detectors were used to determine the amount of the background radiation. The individual sensitivity of each detector was determined before measurements started. The results of the measurements at JSI and IRB show that different badges in different holders posses very similar properties with respect to the sensitivity and the reproducibility of dosimetry system for both ranges of doses. Also, the linearity of the readers’ outputs in low dose range was found satisfactory for both readers. For the doses higher than 0.5 Gy it was found that there exists the difference between results obtained by two readers. It was found that the deviation from the linearity of the JSI reader is up to 20 %. Thus, the doses have to be analysed with the calibration curve instead of the simple straight line.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA