Naslov
Determination of 210Pb in water samples

Autori
Rožmarić Mačefat, Martina ; Grahek, Željko ; Lulić, Stipe

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

Izvornik
IRPA 2006 : Radiation Protection: from Knowledge to Action : Book of Abstracts / - Pariz, 2006

Skup
Second European IRPA Congress on Radiation Protection

Mjesto i datum
Pariz, Francuska, 15.05.2006. - 20.05.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
210Pb; Sr resin; anion exchange column; gamma spectrometry; LSC

Sažetak
Lead-210 is a naturally occurring radionuclide of the 238U series. 210Pb has important role in human radiation exposure because of 210Pb deposit in the skeleton long enough and highly contribute to skeletal dose. 210Pb also can be used for studying of different environmental and marine process (tracing atmospheric process and analyzing the behavior of aerosols in troposphere, determining average erosion rates in soils, understanding sediment chronology etc.). 210Pb emits low energy beta particles (Emax=20 keV 81%, 61 keV 19%) and gamma rays (E=46.5 keV). In both cases measurement is difficult because of low counting efficiency, self absorption, background fluctuation and some other reasons so that indirect measurement techniques has been more usual for the quantification. In indirect quantification, 210Pb is usually determined through its grand-daughter 210Po by alpha spectrometry or, to a less extent, through its beta daughter 210Bi. For this type of 210Pb determination a preconcentration, chemical separation from sample and sufficient in growth period of 210Po (or 210Bi) are required. The main aim of our paper is to show novel procedures for the determination of 210Pb in liquid samples in which some usual determination limits (great sample volume) can be avoided and also to show how other isotopes can be simultaneously isolated and determined. The procedures consist of chemical separation of lead from samples and subsequent quantification of 210Pb by gamma spectrometer. In one procedure, lead is directly isolated from water samples on the column filled with Sr resin by binding of lead to the resin from 0.1 M HCl in a water samples, and successive elution with HCl. In others, lead and strontium are precipitated from water samples with (NH4)2CO3, followed by isolation on a Sr column or an anion exchange column. In a paper, advantages and disadvantages of proposed procedures will be discused in detail.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA