[Intl_DxMedPhys] Shielding for a panoramic unit

[Gary]

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Could someone eyeball this and tell me if I have missed something?  

Shielding for a panoramic unit:  I have the manufacturers specs which give upper range patient doses of 200 mGycm^2, and I have a 2018 paper reporting patient scatter at 1 m for 80 kVp beams as 9.3 nGy/(mGycm^2).

Assuming 50 pt / wk and rounding 9.3 to 10, I get a scatter of 10 x 200 * (100 / 2) = 
	1e5 nGy or 0.1 mGy per week.

And that would go to about 0.025 mGy at 2 meters.  If the workload were 4/5 lower, 40 pt/wk, the unshielded scatter would be 0.02 mGy, the threshold for no lead if all fully occupied uncontrolled spaces are more than 6' away.

Its been a long time since I looked at pano shielding - any suggestions are appreciated.


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Thanks,
Gary Isenhower