Average Radiation Exposure by Staff Position in Millirems Based on 12 Months of Monthly Readings
| Parameter | Period 1 (before) | Period 2 (after) | Change | P |
| Average monthly deep-dose equivalent | ||||
| Nurse | 40.6 ± 11.1 | 24.5 ± 7.1 | −16.2 (−39.8%) | <0.0001 |
| Technologist | 44.0 ± 11.4 | 27.1 ± 7.7 | −16.9 (−38.4%) | <0.0001 |
| Administrative | 3.6 ± 2.0 | 2.3 ± 1.5 | −1.4 (−37.7%) | 0.002 |
| Deep-dose equivalent per 1,000 patients | ||||
| Nurse | 139.1 ± 18.0 | 75.1 ± 8.1 | −64.1 (−46.1%) | <0.0001 |
| Technologist | 149.6 ± 19.7 | 87.0 ± 14.7 | −62.5 (−41.8%) | <0.0001 |
| Administrative | 12.4 ± 5.8 | 7.0 ± 2.2 | −5.4 (−43.5%) | 0.014 |
| Average monthly shallow-dose equivalent | ||||
| Nurse | 40.9 ± 13.0 | 24.2 ± 7.1 | −16.5 (−40.6%) | <0.0001 |
| Technologist | 46.3 ± 12.7 | 26.9 ± 7.5 | −19.4 (−41.9%) | <0.0001 |
| Administrative | 3.6 ± 1.8 | 2.9 ± 1.7 | −0.77 (−21.3%) | 0.04 |
| Shallow-dose equivalent per 1,000 patients | ||||
| Nurse | 139.3 ± 17.5 | 74.1 ± 8.5 | −65.2 (−46.8%) | <0.0001 |
| Technologist | 157.3 ± 24.9 | 83.8 ± 9.5 | −73.5 (−46.7%) | <0.0001 |
| Administrative | 13.4 ± 4.2 | 9.7 ± 3.2 | −3.7 (−27.4%) | 0.04 |
| Average monthly lens-dose equivalent | ||||
| Nurse | 41.5 ± 11.2 | 24.5 ± 7.1 | −17.0 (−41.0%) | <0.0001 |
| Technologist | 46.2 ± 11.5 | 27.1 ± 7.6 | −19.1 (−41.3%) | <0.0001 |
| Administrative | 3.9 ± 2.0 | 2.5 ± 1.5 | −1.4 (−36.0%) | 0.001 |
| Lens-dose equivalent per 1,000 patients | ||||
| Nurse | 142.0 ± 18.3 | 75.1 ± 8.1 | −67.0 (−47.1%) | <0.0001 |
| Technologist | 157.1 ± 20.4 | 84.6 ± 9.8 | −72.5 (−46.1%) | <0.0001 |
| Administrative | 13.7 ± 5.2 | 8.8 ± 2.8 | −5.0 (−36.1%) | 0.019 |