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)