A device consisting of increasing increments of an absorbing material is called a "reference film."

Name: A device consisting of increasing increments of an absorbing material is called a "reference film."
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A device consisting of increasing increments of an absorbing material is typically referred to as a step wedge or a densitometer calibration tool, not a "reference film." Reference films are used in radiography to compare exposure levels, not to measure or calibrate density directly.

A Device Consisting of Increasing Increments of an Absorbing Material