2019UNE-EN ISO 9697:2019 Water quality - Gross beta activity - Test method using thick source (ISO 9697:2018) (Endorsed by Asociación Española de Normalización in August of 2019.)
2017UNE-EN ISO 9697:2017 Water quality - Gross beta activity in non-saline water - Test method using thick source (ISO 9697:2015)