Knowledge of Basic rules of radiation protection | Yes | No | Total | |||
n | % | n | % | n | % | |
Time | 20 | 95.24 | 1 | 4.76 | 21 | 100 |
Distance | 19 | 90.48 | 2 | 9.52 | 21 | 100 |
The screen | 15 | 71.43 | 6 | 28.57 | 21 | 100 |