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U.S. Department of Health and Human Services

Radiation-Emitting Products

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What optical density (or range) should the facility use for the screen-film contact test and what is the criteria for determining pass or fail for a cassette?

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The final regulations do not specify an optical density, range, or a pass-fail criteria because there has not been a consensus of expert opinion on these items. If a facility follows the same criteria as in the interim regulations, namely a range of 0.70 to 0.80 for the density and fails a cassette for any poor contact area exceeding one centimeter, it would be acceptable. However, this does not preclude the facility from using other appropriate criteria.

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