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RE: Potassium Iodide
The techniques used to produce the radiograph are sent by the technologist.
They set the kVp, which sets the maximum energy of the bremsstrahlung
x-rays, the current or number of photons produced is set by the mA setting,
and time interval over which the film or receptor is exposed. (When you get
a chest or any other x-ray, you may hear the sound of the rotator turing the
target, followed by a slightly louder sound and the beep that indicates the
exposure is complete.
For a typical 14 in X 17 in PA chest x-ray at 72 inches, the settings may be
75 kVp, 10 mAs based on the film speed. If the current is 100 mA, the timer
will be 0.1 second. If the current is higher, the time is shorter.
I don't know of many GM meters that can respond that quickly.
-- John
John P. Jacobus, MS
Certified Health Physicist
e-mail: jenday1@msn.com
-----Original Message-----
From: Michael McNaughton [mailto:mcnaught@lanl.gov]
Sent: Friday, December 20, 2002 9:58 AM
To: Jacobus, John (NIH/OD/ORS); 'Richard L. Hess'; 'RadSafe'
Subject: RE: Potassium Iodide
At 05:36 PM 12/19/2002 -0500, Jacobus, John (NIH/OD/ORS) wrote:
>Since the x-rays are delivered in milliseconds, I doubt your meter will be
>able to respond fast enough to give any kind of valid response.
I don't understand this argument. All x-rays and all gamma rays are
delivered in about a nano-second ...
mike
Mike McNaughton
Los Alamos National Lab.
email: mcnaught@LANL.gov or mcnaughton@LANL.gov
phone: 505-667-6130
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