Q. According to ASTM E709-95 when applying fluorescent magnetic particles technique,the operator shall be in darkness area at least......................prior to examination: (Solved)
1. 2 min
2. 3 min
3. 4 min
4. 5 min
- b. 3 min
1. 2 min
2. 3 min
3. 4 min
4. 5 min