United States Nuclear Regulatory Commission - Protecting People and the Environment

U.S. Nuclear Regulatory Commission

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


Page Last Reviewed/Updated Thursday, March 29, 2012