Re: lead apron thicknesses

["Sandy Perle" <sandyfl@earthlink.net>]

>This seemed to be the community standard 10 years ago, with certain
>standards (e.g. Webster's conversion from neck and waist film badge
>readings to effective dose equivalent, Health Physics 56:568-569; 1989)
>built on the assumption of a 0.5 mm apron.

There has been a follow-up to the above referenced document, published as 
Correspondence, Letter to the Editor, Health Physics Society Journal, 0017-
9078/94, 1994, by Marvin Rosenstein and Edward Webster. The title of the 
article is Effective Dose to Personnel Wearing Protective Aprons During 
Fluoroscopy and Interventional Radiology.

"The data is for aprons with 0.3 and 0.5 mm Pb. In the Table 2, Empirical 
formula and estimatesr effective dose (e) using two film badges and the 
conversion factors of Faulkner and Marshall (1993), apron present, over-table 
and under-table x-ray tubes, the following conclusions are presented:
Over the stated range of conditions, the estimates range between 0.98 to 1.84 
E for 0.5-mm lead aprons and between 1.13 to 1.89 E for 0.3-mm lead aprons. 
Our criteria for a desired formula are met. The sole underestimate is 0.98 ; the 
largest overestimate is 1.89 E. The estimate for the most frequently 
encountered combination (i.e., 90 kVp, 0.5-mm lead apron, under-table x-ray 
tube) is 0.98 E.

Use of the formula would be a simple and practical way to monitor E when both 
film badges are worn."



------------------
Sandy Perle
Technical Director
ICN Dosimetry Division
Costa Mesa, CA 92626
Office: (800) 548-5100 x2306 
Fax:    (714) 668-3111
  
sandyfl@earthlink.net
sperle@icnpharm.com

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