Table 1. Prospective dose survey results, part of the risk assessment for use of the designated theatre. Accuracy of values is ±20%. All values are for the unshielded source, with numerals corresponding to locations shown in Figure 3.

Location	Mean dose rate (μSv h−1)
1. Behind screen	34
2. Anaesthetic room door	640
3. External door (behind screen)	50
4. External anaesthetic room door	3.0
5. External scrub room door	1.4
6. Sluice room hatch	6.0
7. Rear waste hatch	9.0
Air vent (service corridor side)	320