Selectivity analysis of ⁹⁹Tc determination by LSC in the field of nuclear decommissioning

In this work, two Tc radiochemical isolation methods - a conventional method by Triskem TEVA® resin and a rapid method by Empore™ Tc Rad Disk - are compared in the field of nuclear decommissioning and ⁹⁹Tc assessment. The conventional method results more selective than the rapid one, being able to remove almost 100% of the main radiological interferers with the exception of the ⁹⁰Y; however, the rapid method obtains higher chemical yields (97% vs. 80%) and slightly lower detection limits (0.025 Bq vs. 0.030 Bq) than the conventional. Both methods are similar with regards to equipment and reagent costs. (author)