Beta particles and photon emitters

For Beta particles and photon emitters, regulator is US EPA (National Primary Drinking Water Regulations); limit is 4 millirems per year; unit is millirems per year; limit type is MCL (Maximum Contaminant Level), recorded from its source on 2026-08-06; source re-checked 2026-09-16.

Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.

What the source says

Beta particles and photon emitters | none ---------- zero | 4 millirems per year

— epa.gov, retrieved 2026-08-06

Source

• epa.govhttps://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations

Last verified against source: 2026-09-16. Due for re-check by 2027-08-06. This page as Markdown · OKF bundle · full dataset as JSON.