AS 3507.1-2003 pdf free.Non-destructive testing – Part1:Guide to radiography for ferrous castings.
Diagnosis of the nature of discontinuities located by radiography can only be made by consideration of both metallurgical and radiographic factors. Consideration should therefore be given to the method of manufacture of the casting under test, and the type, position and probable distribution of any discontinuities likely to be present.
Radiographic sensitivity, in addition to consideration of surface conditions or preparation prior to radiography, depends upon scattered radiation energy (kilovolt or isotope spectrum ), film/screen combination, scatter radiation control, exposure geometry( source to film distance and effective source size )and several less important parameters: usually, the highest sensitivity methods necessitate the use of X-rays. However, thickness limitations and accessibility may preclude the use of X-rays.
For hollow components it may be possible to use single-wall or double-wall methods Although radiographic sensitivity obtained with single-wall methods is generally superior to that obtained with double-wall methods, other factors such as diameter, thickness and accessibility may have a pronounced influence on the choice of a method.
Where alternatives exist. the exact method should be agreed on between customer and contractor if not covered by the product or application Standard.
Non-destructive testing methods are mutually complementary; it is emphasized that the results of one test should be considered in relation to those obtained by another method Accordingly differing interpretations may be required to be reassessed by alternative methods.
This Standard specifies the methods for film radiography of whole or specified areas of ferrous castings.
NOTES:
1 Information to be supplied with the enquiry and order is given in Appendix A.
2 Any repair welding carried out is deemed to be part of the casting.
3 DEFINITIONS
For the purpose of this Standard, the definitions given in AS 1929 appl
4 DESIGNATION
4.1 Principle
Radiographic methods shall be designated in accordance with the following scheme (seeTable 1)
(a)By a prefix letter” to signify testing of a casting.
(b)By a second letter to indicate source of ionizing radiation, as follows:
G-Gamma-ray source
M-Mega electron-volt source
X-X-ray source
(c)By the numeral 0, 1, 2, 3 or 4 to indicate film type(see Appendix D)
NOTE: Examples of designations: CM, CXI and CG2.
5 SAFETY PRECAUTIONS
Exposure of any part of the human body to ionizing radiation can be injurious. It therefore essential that when X-ray equipment or radioactive sources are being used adequate precautions shall be taken to protect testing personnel and any other persons in the
NOTE: The use of radioactive substances and irradiating apparatus is controlled by various statutory regulations. Reference should also be made to the Code of Practice for the Control and Safe Handling of Sealed Radioactive Sources used in Industrial Radiography.