ASTM E545 involves the use of an Image Quality Indicator (IQI) system to measure the relative quality of radiographic pictures produced by direct, thermal neutron radiography. The values stated in SI should be considered as standard.
Scope:
ASTM E545-14 test method is intended to provide quantitative data on neutron beam and image system parameters that affect film exposure and, as a result, overall image quality. It can be used to check the neutron radiography quality on a day-to-day basis.
Procedure:
In ASTM E545, the evaluation of pictures obtained from indicators that are exposed along with the test object is used to judge the quality of a neutron radiograph. In circumstances when the film size is limited or the object size is large, the indicators may be exposed on another film immediately before or after the test object is exposed under the same conditions.
Specimen size:
The optical density of background film should be in the range from 2.0 to 3.0 across the film and does not vary more than ±5%.
Calculation:
The effective pair production can be calculated by using the following equation:
P = (∆DL/DH) × 100
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