Document: NRC Regulatory Guide
Document ID: 96baa826-d3bb-478b-8f38-e74500f6d433
Document Type: regulatory_guide
Title: 06/2009 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0911/ML091170109.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.21
CFR Part: 
CFR Title: 

Content:
eral population. (This term typically refers to members of the public). See Regulatory Guide 1.109 for additional information.) member of the public (10 CFR 20)—Means any individual except when that individual is receiving an occupational dose. member of the public (40 CFR 190)—Means any individual that can receive a radiation dose in the general environment, whether he may or may not also be exposed to radiation in an occupation associated with a nuclear fuel cycle. However, an individual is not considered a member of the public during any period in which the individual is engaged in carrying out any operation which is part of a nuclear fuel cycle. minimum detectable concentration—The smallest activity concentration measurement that is practically achievable with a given instrument and type of measurement procedure. It depends on factors involved in the survey measurement process (surface type, geometry, backscatter, and self- absorption) and is typically calculated following an actual sample analysis (a posteriori). (See NUREG-1507, “Minimum Detectable Concentrations with Typical Radiation Survey Instruments for Various Contaminants and Field Conditions,” issued June 1998 (Ref. 52)). mixed mode release—A gaseous effluent release made from a height higher than a ground-level release but less than an elevated release where, because of a lack of plume rise (e.g., buoyancy, momentum, and wind speed), a proper estimate of radionuclide transport and dispersion requires mathematically splitting the plume into (1) an elevated component and (2) a ground-level component to properly account for building wake effects. (See Regulatory Guide 1.111 for further guidance.) monitoring—Radiation monitoring, radiation protection monitoring means the measurement of radiation levels, concentrations, surface area concentrations or quantities of radioactive material and the use of results of these measurements to evaluate potential exposures and doses. nonroutine, planned