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Radiography Exposure
Steve,
You really need to know the type (film speed) of radiography film being
used. Radiography film just like photographic film has a large
variation in film speed. Typically radiographers are shooting for an
H&D density of 2.0. The following are some typical exposures for that
density:
Ir-192 Co-60
Dupont 45 6.0 R 14.0 R
Dupont 55 2.0 R 4.0 R
Dupont 65 1.1 R 2.30 R
Dupont 70 0.62 R 1.70 R
Dupont 75 0.36 R 0.75 R
AGFA D2 13.0 R 30.0 R
AGFA D4 3.5 R 8.5 R
AGFA D5 1.7 R 4.0 R
AGFA D7 1.0 R 2.2 R
Kodak M 4.5 R 12.9 R
Kodak AA 0.99 R 2.14 R
Roy A. Parker, Ph.D.
E-Mail: 70472.711@compuserve.com
Tel: 225-924-1473 - Note new area code
Fax: 225-924-4269 - Note new area code
-------------( Forwarded computer archived letter follows )-------------
21-Sep-98 16:40 CDT
From: Steven.Rima@DOEGJPO.COM (Steven Rima)
Subject: Radiography Exposure Question
Radsafers,
In order to calculate a "possible theoretical" dose/exposure to a
person in a certain situation, I need to know what the typical
exposure or absorbed dose in industrial radiography is. What I am
looking for in particular (and couldn't find in any books that I have)
is the total exposure or absorbed dose TO or AT THE FILM required to
get a good picture. If anyone can answer this, I'd greatly appreciate
it. A "ballpark" or typical exposure/dose number is good enough.
Thanks in advance,
Steven D. Rima, CHP
Manager, Health Physics and Industrial Hygiene
MACTEC-ERS, LLC
steven.rima@doegjpo.com
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