Re: Dose Calib. Geometry Daily! HELP!

[Bob Dunn <rso.gscancer@worldnet.att.net>]

AHC Inc NM wrote:
> 
> Subject:     Dose Calib. Geometry Daily!  HELP!
> Sent:        3/3/98 8:29 PM
> To:          radsafe@romulus.ehs.uiuc.edu
> From:        ahcincnm@aol.com
> 
> Does anyone have experience using a Dose Calibrator in a mobile setting
> (van) and supporting info. for ruuning a Geometric Variation less than
> daily?
> 
> We run the somewhat time consuming geometry test everyday to meet our
> license and State regulatory body requirements! Consider also, accuracy
> with 3 sources, constancy and linearity are also a part of morning QC.
> 
> Is anyone familiar with any existing documents or papers that may be
> helpful in an amendment?
> 
> G Thomas Preston, CNMT
> AHC, Inc.
> 800 999 9154 x6Dear Mr. Preston,
According to 10 CFR Part 35, section 35.50 (b) (4), "Test each dose 
calibrator for geometry dependence upon installation over the range of 
volumes and volume configurations for which it will be used. The 
licensee shall keep a record of this test for the duration of the use of 
the dose calibrator." Section 35.52 (b) (1) Geometry dependence must be 
peroformed before initial use, periodically, and following repair, for 
alpha- or beta-emitting radionuclides, for doses other than unit dosages 
obtained pursuant to paragraph (a) of the same section. I do not know 
the requirements of your state licensing agency, but review these 
sections of 10 CFR 35. you may be performing geometry more often than is 
necessary. But then again, the NRC wiuld rather see too much being done 
than not enough! I hope this helps. Take care.
Bob Dunn
rso.gscancer@worldnet.att.net