| 摘要 |
Apparatus for the inspection of a pipe weld 3 by radiography comprises a radiation source 27 contained in a housing 12 having a first collimator 14 for defining the exit beam and a second collimator 17 mountable on the pipe in the region of the weld 3 to define with the first collimator a predetermined volume enclosing the radiation beam passing through the second collimator 17 when the housing is in a predetermined position relative to the second collimator. The arrangement is such that if the housing is slightly displaced from the predetermined position the radiation beam still falls within the predetermined volume. <IMAGE> |
