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:
d byproduct materials from the cycle. χ/Q—Referred to as “Xi over Q,” χ/Q is the average atmospheric effluent concentration, χ, normalized by release rate, Q, at a distance (or location) in a given downwind direction. Expressed in another way, χ/Q is the concentration (χ) of airborne radioactive material (e.g., in units of μCi/m3) divided by the release rate (Q) (e.g., in units of μCi/s) at a specified distance and direction downwind of the release point. Rev. 2 of RG 1.21, Page 50 REFERENCES1 1 Publicly available NRC published documents such as Regulations, Regulatory Guides, NUREGs, and Generic Letters listed herein are available electronically through the Electronic Reading room on the NRC’s public Web site at: http://www.nrc.gov/reading-rm/doc-collections/. Copies are also available for inspection or copying for a fee from the NRC’s Public Document Room (PDR) at 11555 Rockville Pike, Rockville, MD; the mailing address is USNRC PDR, Washington, DC 20555; telephone 301-415-4737 or (800) 397-4209; fax (301) 415-3548; and e-mail PDR.Resource@nrc.gov. 1. Staff Requirements for SECY-98-144, “White Paper on Risk Informed and Performance-Based Regulation,” U.S. Nuclear Regulatory Commission, Washington, DC, March 1, 1999. (ADAMS ML003753593) 2. 10 CFR Part 20, “Standards for Protection against Radiation,” U.S. Nuclear Regulatory Commission, Washington, DC. 3. 10 CFR Part 50, “Domestic Licensing of Production and Utilization Facilities,” U.S. Nuclear Regulatory Commission, Washington, DC. 4. 10 CFR Part 72, “Licensing Requirements for the Independent Storage of Spent Nuclear Fuel, High Level Radioactive Waste, and Reactor-Related Greater Than Class C Waste,” U.S. Nuclear Regulatory Commission, Washington, DC. 5. Regulatory Guide 1.109, “Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purpose of Demonstrating Compliance with 10 CFR Part 50, Appendix I,” U.S. Nuclear Regulatory Commission,