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Subject: Re: x-ray dose calculation

Date: 06/24/03 at 2:37 PM
Posted by: chris
E-mail: cg@icm.be
Message Posted:

In Reply to: x-ray dose calculation posted by ugur arin on 06/24/03 at 9:17 AM:

There is no way to "calculate" xray dose just from kV and mA.

It depends on the voltage waveform (is it 150 kV DC - 500 mA DC or 150 kV pk and 500 mA av ?), and accuracy (is it really 150 kV; dose does not vary lineary with voltage), inherent filtration (what kind of material do Xray cross before going out the generator), target nature (W),target angle...

The better way to solve your problem is simply to *measure* it with a dosimeter. If you use such an xray generator, you must have one !

Whatever, very very roughly, such a generator should generate a dose of about 2 Sv/s at 150 kV DC - 500 mA DC - 1 m if glass filters Xray.

For 100 kV - 100 mA - 1 m, I would evaluate it to 0.01 Sv/s

Nb: admissible dose for people not professionnaly exposed to Xray is 0.001 Sv / ... year.

Regards,
-chris



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