Naslov
Osjetljivost LiF termoluminescentnih detektora na termalne i brze neutrone
(Sensitivity of LiF TL detectors in thermal and fast neutron irradiation fields)

Autori
Ranogajec-Komor, Maria ; Osvay, Margit ; Miljanić, Saveta ; Blagus, Saša

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

Izvornik
Zbornik radova 6. simpozija Hrvatskog društva za zaštitu od zračenja / Garaj-Vrhovac, Verica ; Kopjar, Nevenka ; Miljanić, Saveta - Zagreb : Hrvatsko društvo za zaštitu od zračenja, 2005, 105-110

Skup
6. simpozij Hrvatskog društva za zaštitu od zračenja

Mjesto i datum
Stubičke Toplice, Hrvatska, 18.04.2005. - 20.04.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
TL detektori; termalni neutroni; brzi neutroni
(TL detectors; thermal neutrons; fast neutrons)

Sažetak
The sensitivity of the most TL dosimeters (expressed as the TL response/absorbed dose) decreases with increasing LET. However, it is known that the 'high temperature peak' (HTP or peak 7) of LiF detectors increases with increasing LET, while the 'low temperature peak' of LiF (LTP or peak 5) decreases. There is no aggreement in the literature on the linearity results of LTP and HTP using high LET radiation field. The reason in most cases is that the gamma background in the mixed field is not taken properly into consideration. The aim of this study was to investigate the linearity of LTP and HTP for TLD-100, TLD-700 (Harshaw) and MTS-N (Poland) LiF dosimeters and to compare the LET sensitivity of these LiF using thermalized neutron radiation in the range of 1 to 150 mSv dose and fast neutrons (14.5 MeV) in the dose range 25 mSv-200 mSv. The following irradiations of TLDs were performed: a) gamma with 137Cs source, b) thermal neutron with 238Pu-Be source (flux: 2x107 n/s) using a 20 cm diameter spherical polyethylene moderator, c)14.5 MeV fast neutrons produced by Texas Nuclear Corporation 300 keV electrostatic accelerator using T(d, n)α nuclear reaction. The gamma component was measured by Al2O3:Mg, Y ceramic TL dosimeters in the thermal neuron irradiation field and by Mg-Ar chamber in the fast neutron irradiation field, respectively. It was found, that while the gamma sensitivity of LiF(P) to TLD-100 is about 2.5, the thermal neutron sensitivity differs not so much, i.e. 1.4 (at 15 mSv) and 1.25 (at 150 mSv). The high temperature TL peak is linear for both kinds of LiF dosimeters in the thermal dose range (1– 150 mSv) investigated. In a respect of selectivity both LiF(P) and TLD-100 are suitable for selective measurement of neutron dose in a mixed neutron-gamma radiation for accidental dosimetry purposes.

Izvorni jezik
Hrvatski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA