# The Private Water Supplies Regulations (Northern Ireland) 2017, Paragraph 6: Monitoring for Compliance with the ID


Screening strategy for gross alpha activity and gross beta activity may be used to monitor for the parametric indicator value for indicative dose.
If the gross alpha activity is less than 0.1 Bq/l and the gross beta activity is less than 1.0 Bq/l, it may be assumed that the total indicative dose is less than 0.1 mSv and radiological investigation is not needed unless it is known from other sources of information that specific radionuclides are present in water that are liable to cause an excess of 0.1 mSv.
If the gross alpha activity exceeds 0.1Bq/l or the gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.
The radionuclides to be measured must be based on all relevant information about likely sources of radioactivity.

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Source: https://www.legislation.gov.uk/nisr/2017/211/schedule/4/paragraph/6 (the official version)
Page: https://openlegislation.uk/private-water-supplies-regulations-northern-ireland-2017/schedule-4/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.