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A Comment on assigned dose
Group,
In reference to Sandy Perle's comment regarding assigned dose. My
understanding is that the NRC does not accept the Webster or other
calculations of assigned dose and requires the use, as he indicated of the
highest reading to assign dose. NRC has jurisdiction over byproduct
radioactive materials and not over machine produced radiation. As a federal
facility we are regulated by NRC for byproduct material only. Most
facilities will be governed by state regulations in the area of machine
produced radiation whether or not they are an agreement state.
The Suggested State Regulations for the Control of Radiation published by
the Conference of Radiation Control Program Directors D.201 c. ii. says,
"When a protective apron is worn while working with medical fluoroscopy
equipment...
[1] ...the reported deep dose equivalent shall be the effective deep doe
equivalent for external radiation or
[2] When only one individual monitoring device is used and is located on
the neck outside of the protective apron and the reported dose exceeds 25%
of the limit ... the reported deep dose equivalent value multiplied by 0.3
shall be the effective dose equivalent for external radiation
[3] When individual monitoring devices are worn, both under the protective
apron... and outside the protective apron...shall be..." I'm going to just
say it's the Webster formula to cut down on the length of this message.
It appears then that the CRCPD endorses the use of the Webster formula for
fluoroscopy.
Provided that the state you are in has followed the Suggested regulations,
almost anybody that has fluoro exposure where lead aprons are worn may elect
to use the Webster formula rather than the highest reading as an assigned
EDE.
Check your state regs to be sure.
Any opinions expressed are mine alone and do not necessarily represent those
of the Denver VA Medical Center, The Department of Veterans Affairs, or the
U.S. Government.
Peter G. Vernig
Radiation Safety Officer, VA Medical Center, 1055 Clermont St. Denver, CO
80220, ATTN; RSO MS 115
303-399-8020 ext. 2447, peter.vernig@med.va.gov [alternate
vernig.peter@forum.va.gov] Fax 303-393-5026 [8 - 4:30 MT service] Alternate
Fax 303-377-5686
"You win some, you lose some, and some get rained out." Y. Berra
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