Re: Exposure Rate Formula for X-ray Machine

[Carl_Tarantino@vapower.com]

The basic equation for calculating the maximum exposure rate at any occupied
point at a distance d meters from the target in the x-ray tube is:

Xm = P/T R/week,
where P = maximum permissible weekly exposure, i.e. 0.1R/week for controlled
areas and 0.01R/week for uncontrolled areas
             T = occupancy factor
Applying the inverse square law, the exposure rate at 1 meter from the target
may be derived accordingly:

X1 = d2 * Xm = d2*P/T R/week at 1 meter

NCRP Report #49, Structural Shielding Design for Medical Use of X-rays and Gamma
Rays of Energies Up to 10 MeV, should be consulted as a reference.





"Redmond, Randy R. (RXQ) " <RXQ@y12.doe.gov> on 01/03/2000 10:14:39 AM

Please respond to radsafe@romulus.ehs.uiuc.edu


To:   Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
cc:    (bcc: Carl Tarantino/NUC/VANCPOWER)

Subject:  Exposure Rate Formula for X-ray Machine




Need a formula for calculating/estimating X-ray machine exposure rate.

Thank you,

Randy Redmond
Lockheed Martin Energy Systems
P.O. Box 2009
Bldg.  9769,  MS 8081
Oak Ridge, TN  37831-8081
Email:  rxq@y12.doe.gov
Phone:  423-574-5640
Fax:  423-576-6047

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