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Time optimization of Sr-90 measurements: Sequential measurement of multiple samples during ingrowth of Y-90

S. Holmgren ; A. Tovedal ; O. Bjornham ; Henrik Ramebäck (Institutionen för kemi och kemiteknik, Kärnkemi)
Applied Radiation and Isotopes (0969-8043). Vol. 110 (2016), p. 150-154.
[Artikel, refereegranskad vetenskaplig]

The aim of this paper is to contribute to a more rapid determination of a series of samples containing Sr-90 by making the Cherenkov measurement of the daughter nuclide Y-90 more time efficient. There are many instances when an optimization of the measurement method might be favorable, such as; situations requiring rapid results in order to make urgent decisions or, on the other hand, to maximize the throughput of samples in a limited available time span. In order to minimize the total analysis time, a mathematical model was developed which calculates the time of ingrowth as well as individual measurement times for n samples in a series. This work is focused on the measurement of Y-90 during ingrowth, after an initial chemical separation of strontium, in which it is assumed that no other radioactive strontium isotopes are present. By using a fixed minimum detectable activity (MDA) and iterating the measurement time for each consecutive sample the total analysis time will be less, compared to using the same measurement time for all samples. It was found that by optimization, the total analysis time for 10 samples can be decreased greatly, from 21 h to 6.5 h, when assuming a MDA of 1 Bq/L and at a background count rate of approximately 0.8 cpm.

Nyckelord: Sr-90, Y-90, Optimization, Sequential measurement, Multiple samples



Denna post skapades 2016-04-22.
CPL Pubid: 235049

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Kärnkemi

Ämnesområden

Kärnkemi

Chalmers infrastruktur