. 2011 Nov;84(1007):1034–1039. doi: 10.1259/bjr/29466902

Table 2. Environmental dose survey measurements for 40 patients at key positions (1–6) around theatre shown in Figure 3, and occasional representative readings at other positions. Accuracy of values is ±20% and zero refers to readings below the background of approximately 0.1 μSv h⁻¹.

Location	Mean dose rate (μSv h⁻¹) (range)
1. Behind screen	1.6 (0.4–6.4)
2. Anaesthetic room door
(behind screen)	1.0 (0–5.6)
(not behind screen)	(0–64)
3. External door
(waist height, behind screen)	1.2 (0–6.0)
(head height, behind screen)	2.8 (0.2–12)
(waist height, not behind screen)	(0.2–20)
(head height, not behind screen)	(0.2–32)
4. External anaesthetic room door	0.2 (0–1.2)
5. External scrub room door	0.2 (0–0.8)
6. Sluice room hatch	1.0 (0–5.8)
7. Rear waste hatch	(0–0.2)
Air vent (service corridor side)	0
Floor below (offices)	0
In front of screen	240
1 m from source	580
Behind lead aprons	(0.6–2.4)

Table 2. Environmental dose survey measurements for 40 patients at key positions (1–6) around theatre shown in Figure 3, and occasional representative readings at other positions. Accuracy of values is ±20% and zero refers to readings below the background of approximately 0.1 μSv h−1.