Understanding Neutron Radiography Reading VII-NRHB Part 2 of 2

2.5 MEASUREMENT
2.5.1 Definition and Methods
2.5.1.1 In the context of this document measurement may be defined as the
determination of the physical size of some feature of a fuel pin or similar
object, i.e. fuel pellet diameter or length, radial gaps, cladding thickness, etc.
2.5.1.2 Measurement may be made directly from the radiograph, making due
allowance for any enlargement or reduction caused by the radiographic
conditions, or by the use of a comparitor of known dimensions which also
appears on the radiograph.
2.5.1.3 As this document is only concerned with the radiography of nuclear
fuel the following discussion will be confined to the measurement of
cylindrical object.
Charlie Chong/ Fion Zhang