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The U.S. Nuclear Regulatory Commission is in the process of rescinding or revising guidance and policies posted on this webpage in accordance with Executive Order 14151 Ending Radical and Wasteful Government DEI Programs and Preferencing, and Executive Order 14168 Defending Women From Gender Ideology Extremism and Restoring Biological Truth to the Federal Government. In the interim, any previously issued diversity, equity, inclusion, or gender-related guidance on this webpage should be considered rescinded that is inconsistent with these Executive Orders.

Home About NRC Radiation Protection How the NRC Protects You Health Physics Positions Based on 10 CFR Part 20

Health Physics Questions and Answers - Question 103

Question 103: 10 CFR 20.1302 (b) (2) (ii) refers to "the dose from external sources."

(a) What are "external sources"?

(b) Are both (1) shine from the facility or from stored contaminated materials and sources, as well as (2) cloud shine from effluents to be included?

Answer:

(a) "External sources" are radiation sources outside the body.

(b) Yes.

(Reference: 10 CFR 20.1302).

Page Last Reviewed/Updated Tuesday, October 31, 2017