Paragraph 11 I1 England and Wales If the gross alpha activity exceeds 0,1Bq/l or the gross beta activity exceeds 1,0Bq/l, analysis for specific radionuclides is required. Annotations Commencement I1 Sch. 4 para. 11 in force at 20.11.2017, see reg. 1 ← Paragraph 10 Paragraph 11 Paragraph 12 →