Document: NRC Regulatory Guide
Document ID: c0dbb594-6262-4b83-96b1-366758ad9676
Document Type: regulatory_guide
Title: Interim Licensing policy on as low as Practicable for Gaseous Radiodine Releases from Light-Water-Cooled Nuclear Power Reactors (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1229/ML12298A137.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.42
CFR Part: 
CFR Title: 

Content:
e of 15 mrem to the thyroid (2 gm) of a child if the child were to consume one liter of that milk daily for a year. To assure that a child does not Qreceive such a dose, it is necessary to know with a reasonable degree of certainty the actual 1-131 concentration of the milk at these levels. Therefore, the milk should be sampled and analyzed for 1-131 weekly with a sensitivity of 0.5 pCi/liter, with an overall error of + 25%. This sensitivity and accuracy are readily attainable using a 4-liter sample of milk and state-of-the-art counting equipment, and such analyses are now offered on a routine commercially available basis. Analytical methods -fr achieving this sensitivi.ty are described in Regulator•y Guide 4.3,. "Measurements of Radionuclides in the Environment - Analysis of 1-131 in Milk," (September 1973). 1. 42-Dl