[UpAllNight]

--You're right - there is a difference between a mRad and a mRem. However, in this case, they're equivalent:--

Correct. However, the ESE units do not take into account the "effective" dose to the skin. The skin has a multiplier of about 0.01 thus making 200 mR ESE equivalent to about 2 mRem effective skin dose.

[AFPhys]

The multiplier is apparently taken into account in the Utah graph above. Easiest thing here now is to look for another place to settle this.

Another source has everything in the same units- mrem:
http://www.uvm.edu/~radsafe/?Page=xray.analytical.html

Background and other dose levels;

* 295 mrem (millirem) - average background dose in U.S.
* 300 mrem - average dose from 1 abdomen radiograph
* 200 mrem - average dose from 1 dental radiograph
* 20 mrem - average dose from 1 chest radiograph
* 3 mrem - average dose to UVM personnel in 1 year