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Title: DENSITOMETER CALIBRATION PROCEDURE
DENSITOMETER CALIBRATION PROCEDURE
黑度计校验工艺规程
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Title: DENSITOMETER CALIBRATION PROCEDURE
Scope
This procedure covers the calibration of transmission densitometers used to perform radiographic film density measurements and provides a means of evaluating the reliability of transmission densitometers used for the measurement of radiographic film density. This procedure is prepared reference to se-1079 "standard practice for CALIBRATION OFTRANSMISSION DESITOMETERS" of ASME Sect. V.
Apparatus
Apparatus should consist of the following:
The X-ray film step tablet standard of the National Center of Measuring having at least 5 steps with neutral densities from at least through . The calibration of the step wedge film shall have been verified within the last 12 month by comparision with a National Center of Measuring serialized step tablet.
Transmission Densitometers with digital readout displays specifically manufactured for the purpose of measuring the range of film densities, described in shall be used.
Manufacturer's Operating Instruction for Appropriate Transmission Densitometer.
Calibration
Full-scale linearity calibration of densitometer sha