[ RadSafe ] A long shot here ....

[parthasarathy k s]

Dear Dan,
According to my information formal laws to control medical x-ray equipment were drafted when concerned people found that colour television units were exposing technicians repairing the units to high radiation doses; also another matter of concern was the discovery that microwave ovens were cooking house wives in addition to chicken!!.
There was an interesting article on history of medical x-ray laws in Health Physics by Ms Nader , the sister of the activist Ralph Nader
RegardsParthasarathy

 

    On Saturday, 19 December 2015, 1:23, Dan McCarn <hotgreenchile at gmail.com> wrote:
 

 Dang!

That would mean that my old 5kv at 0.5 amp power supply with a full-wave rectifier consisting of 4 mercury vapor tubes (that glowed so eerily) probably gave me a dose in my teens. 

Dan W McCarn
108 Sherwood Blvd
Los Alamos, NM 87544 USA
+1-505-670-8123
Sent from my iPhone

> On Dec 18, 2015, at 12:44, Ted de Castro <tdc at xrayted.com> wrote:
> 
> On page 164 of the 1970 Radiological Health Handbook is a very useful graph entitled "Half-Value layers at Photon from 10 keV to 10 meV".
> 
> I was looking into electronic ways to interpolate values from the graph but found that the only twp pieces of software that would allow me to get absolute pixel coordinates from the image are Photo Shop or MatLab - I have neither and can't afford either.  (with the pixel coordinates of the 4 corners of the plot and the point of interest - a spreadsheet that would return the value of the point of interest would be a trivial exercise).
> 
> So - the question here is - does anyone have this plot in a better quality electronic image, or has anyone worked out the data points from which it was compiled or has anyone come up with or found an electronic way to get this information?
> 
> Thanks
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