ISO 21613:2015 describes a method for determining chlorine and fluorine in mixed (U,Pu)O₂ powders and sintered pellets. It is applicable for the analysis of samples containing 5 µg.g⁻¹ to 50 µg.g⁻¹ of chlorine and 2 µg.g⁻¹ to 50 µg.g⁻¹of fluorine.

For UO₂ powder and sintered pellets, refer to ISO 22875.