Naslov
Combination of an automated isolation method and gamma spectrometry for determination of Fe- 55 in complex samples

Autori
Tucaković, Ivana ; Coha, Ivana ; Grahek, Željko

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

Izvornik
18th Radiochemical Conference, in Czech Chemical Society Symposium Series, Vol 16, No 2 / - , 2018, 170-170

Skup
18th Radiochemical Conference (RadChem 2018)

Mjesto i datum
Mariánské Lázně, Češka Republika, 13.05.2018. - 18.05.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Podatak o recenziji nije dostupan

Ključne riječi
Iron-55 ; gamma spectometry

Sažetak
Radioactive Fe-55 is generated by neutron activation of stable iron and, therefore, it can be found in materials from nuclear power plant, which should be decommissioned. It decays by electron capture and emits x-ray of 5.9 keV (24.5% probability). Because of the low energy of emitted ray, the attenuation effect is large and it occurs already in the sample itself, therefore it is the most often measured via liquid scintillation counting (LSC). However, modern HPGe detectors allow the determination of gamma emitters in a wide range of energies (3 keV - 3 MeV). In case of LSC, prior determination, isolation of pure iron from the sample is essential. Most of the samples may contain higher amounts of iron, so chemical and color quenching effects are important since they can significantly decrease detection efficiency. Therefore, within this study, especially for samples with higher amounts of iron, the method for Fe-55 determination by gamma spectrometry is developed. In this case, chemical isolation from the sample is also desirable to decrease attenuation effect and if present, to remove Co58 and Mn-54 which emit x-rays in the same range (5.4 keV for Mn-54 and 6.4 keV for Co- 58). The geometry of the sample is optimized to minimize the attenuation effect. For the chemical isolation of Fe-55 from complex samples an automated method which includes separation of iron from interfering elements on Sr resin or Pb resincolumnwillbedescribed(SrandPbresinconsisto f 4, 4’(5’)-di-t-butylcyclohexano18-crown-6in1- octanolor isodecanol loaded on an inert chromatographic support). TheSrand/orPbresinarechosensincetheycanbeused for simultaneous separation of strontium isotopes 89, 90Sr which are also present in different kind of materials from nuclear power plant. In almost all published methods, isolation and determination of Sr-89, 90 and Fe- 55 are separated, while here it will be shown how Sr and/or Pb resin enables simultaneous isolation of 89, 90Sr and Fe-55 in one step. This work will also include optimization of the sample preparation method in the sense of achieving a detection limit of Fe-55 as low as possible.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija, Interdisciplinarne prirodne znanosti

POVEZANOST RADA