Adsorption efficiency correction for ²²⁶Ra determination on drinking water using Ra-Nucfilm disc

A specific goal of the French army is to ensure health protection of soldiers consuming water from overseas operations territories. To do so, the French Defence Radiological Protection Service developed a method to quantify the amount of ²²⁶Ra in water using Ra-Nucfilm discs. ²²⁶Ra analysis is achieved within less than two days and the detection limit, function of adsorption efficiency, ranges from 0.85 to 25 mBq/L. The novelty is the determination of a factor correcting adsorption efficiency, equal to 1.3, from the difference in adsorption between ²²⁶Ra and ¹³³Ba using as internal tracer.