density is time linear
Posted:
9/23/2002 9:13:29 PM
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Subject: time adjustment
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While adding time will increase burn, scatter exposure, and decrease sensitivity somewhat, a simple adjustment in time as opposed to the inverse square law is far quicker and fairly accurate in field radiography. Quite simply if a one minute exposure gives a 1.0 reading, a 3 minute exposure will achieve a 3.0 density. The longer the exposure the less linear the time /density curve is constant, with the exposure acquiring a slighter higher % of density in relation to time, meaning if a 5 minute exposure produces a 1.0, a 15 minute exposure may produce a density reading slightly higher than 3.0 However this is incredibly accurrate with x-ray machines, both low and high energy, which can save time in developing techniques.
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