Separation of strontium from calcium by the use of sodium hydroxide and its application for the determination of long-term background activity concentrations of 90Sr in 100 km area around Kozloduy Nuclear Power Plant (Bulgaria)

Inter-laboratory exercise with an aim to compare methods for 90Sr and 239,240Pu determination in environmental soil samples

“…In this work, a series of precipitation/co-precipitation was employed in the Sr-A method to purify Sr. This method is very robust and reliable, which has been applied to many different sample matrices [31][32][33]. However, due to the relatively low selectivity, repeated precipitation/co-precipitation is needed which makes the protocol very tedious.…”

Determination of plutonium isotopes in environmental samples with triisooctylamine and alpha spectrometry

“…The absence of 238 Pu indicates that the Pu origin must be connected with the global fallout and its dissolution from the soils alongshore the river valleys. Solubility of Pu in sediments-water system is very low-comparable to that of radiocesium, but substantially lower than that of radiostrontium [27,29,30]. For that reason most of the measured activity of Pu is distributed in the suspended solid phase of the collected water samples.…”

Determination of Sr-90 in milk samples from the study of statistical results

“…Both are products of the fis sion of 235 U or 239 Pu, the pro duc tion takes place in nu clear re ac tors and fis sion bombs, be cause their pres ence in the en vi ron ment is re lated to the nuclear in dus try, nu clear test ing and emis sions of an acci den tal na ture [2]. Stron tium is one of the most danger ous pol lut ants in the en vi ron ment be cause of its long half-life, its high sol u bil ity and chem i cal sim i larity be tween the Sr +2 and Ca +2 [3]. Be cause of all these fac tors, stron tium can ac cu mu late in or gan isms through the food chain, be ing pres ent in bi o log i cal sam ples where there is cal cium, such as cow's milk [4,5].…”