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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any previously issued diversity, equity, inclusion, or gender-related guidance on this webpage should be considered rescinded that is inconsistent with these Executive Orders.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 221

Question 221: Since the posting requirements are all in terms of deep dose equivalent, what requirements should be followed when posting for low energy beta radiation?

Answer: Unless the beta particle can deliver a dose at a tissue depth of 1 cm, the area does not require posting as a radiation area (20.1902 (a)), high radiation area (20.1902 (b)), or very high radiation area (20.1902 (c)); however, posting for airborne radioactivity area (20.1901 (d)) and for areas or rooms in which licensed material is used or stored (20.1901 (e)) needs to be considered for beta emitters. See Questions and Answers 57, 74, and 85 for more information.

(Reference: 10 CFR 20.1902, 10 CFR 20.1901)

Page Last Reviewed/Updated Friday, November 24, 2017