References

1. Patrick O, Moore, 2006, American Society for Nondestructive Testing Chapter 7 Principle of Film Radiography, 140-150
2. American Socity for Nondestructive Testing, 2006, Nondestructive Testing Handbook Volume 4 Radiographic Testing Third Edition, Selection of Radiographic Source 74-78
3. Lee Ey Jong, The Korean Nondestructive Testing Publication Gold, Radiography Test 2005. 51-65, Korean
4. Lee Sung Shik, Im Sung Jin, Han Hyen Soo, 2001, Development Radiography Testing Method for Using Se-75,The Korea Society For Nondestructive Testing, Spring Science Meeting Book, 40-46, Korean
5. Park Sang Ki, Lee Yeang Ho, The Study on Image Sensitivity Evaluation for Digital Radiography Image, Journal of the Korea Society for Power System Engineering, 12-6