Naslov
Testiranje novih TLD sustava za mjerenje doze u okolini
(Investigation of the performance of 7-LiF:Mg, Cu, P under environmental conditions)

Autori
Ranogajec-Komor, Maria ; Klemic, Gladys ; Knežević, Željka ; Sengupta, Subhash ; Vekić, Branko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Zbornik radova Četvrtog simpozija Hrvatskog društva za zaštitu od zračenja = Proceedings of the 4th Symposium of the Croatian Radiation Protection Association / Obelić, Bogomil ; Franić, Zdenko - Zagreb : Hrvatsko društvo za zaštitu od zračenja, 1998, 225-230

ISBN
953-96133-2-9

Skup
Četvrti simpozij Hrvatskog društva za zaštitu od zračenja

Mjesto i datum
Zagreb, Hrvatska, 11.11.1998. - 13.11.1998

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Sažetak
The high gamma sensitivity demonstrated by LiF:Mg, Cu, P produced in China and Poland makes it appropriate for environmental applications. Recently a new version of this material has been produced in the United States in both loose chip and encapsulated card form. This study investigates the performance of the US material under conditions designed to simulate environmental insults as described in ANSI Draft Standard N13.29. Twenty dosimeters are placed in an environmental chamber that cycles twice through three 15 day periods of temperature and humidity conditions: -20 degrees C ; +50 degrees C with 20% relative humidity ; and +50 degrees with 90% relative humidity. Five randomly selected dosimeters are exposed to a 137Cs source to doses between 0.5 to 10.0 mSv at the beginning, middle, and end of the 90-day test. Two 40-watt fluorescent bulbs provide lighting in the chamber. Performance is measured by comparison with the proposed Draft N13.29 performance criteria that would require the absolute value of the bias and standard deviation to each be less than or equal to 0.35, while their sum must be less than or equal to 0.50. The performance criteria in ANSI Draft N.13.29 proved to be very useful for introducing new TLD systems in environmental monitoring. This standard is generic and not specific to the methods used to pass its criteria. The 7LiF:Mg, Cu, P chips and cards recently developed by Harshaw passed this performance test together with the Chinese LiF:Mg, Cu, P. The new chips seem to be very promising detectors for environmental dosimetry as they allow short exposure time, and ease in handling. However, the encapsulation of the cards needs changes to be more resistance against temperature and humidity effects. The fading of TL systems in extreme temperature and humidity conditions specified in ANSI Draft N13.29 call for further investigations.

Izvorni jezik
Hrvatski

Znanstvena područja
Kemija

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