| Knowledge of equipment | Yes | No | Total | |||
| n | % | n | % | n | % | |
| Leaded deck | 19 | 90.48 | 2 | 9.52 | 21 | 100 |
| Leaded glove | 12 | 57.14 | 9 | 42.86 | 21 | 100 |
| Gonad cache | 15 | 71.43 | 6 | 28.57 | 21 | 100 |
| Leaded bezel | 12 | 57.14 | 9 | 42.86 | 21 | 100 |
| Leaden screen | 20 | 95.24 | 1 | 4.76 | 21 | 100 |
| Thyroid cache | 16 | 76.19 | 5 | 23.81 | 21 | 100 |