§ Mr. Andrew F. BennettTo ask the Secretary of State for Defence what is the maximum total radiation dose recorded for any Chatham dockyard worker registered in the defence radiological protection services' record-keeping system; over what period it accrued; and what are the 20 highest doses recorded.
§ Mr. Kenneth CarlisleThe maximum lifetime total radiation dose for a Chatham worker currently registered in the DRPS's record-keeping system is 511.6 milliSieverts. This total dose was accrued over the period 1 January 1968 to 5 December 1983.
The 20 highest doses recorded for workers so registered are shown in the table:
Highest Radiation Doses/Chatham Dockyard Cumulative dose (mSv) 511.60 420.21 403.13 396.99 393.58 387.46 366.57 365.44 352.88 348.27 340.57 325.06 320.74 307.87 307.43 304.86 298.44 297.05 295.45 288.07
§ Mr. Andrew F. BennettTo ask the Secretary of State for Defence (1) if he will give a breakdown for Rosyth dockyard of annual individual radiation exposure for Rolls-Royce personnel in the bands of(a) nought to 10, (b) 10 to 20, (c) 20 to 30, (d) 30 to 40, (e) greater than 50, (f) greater than 70 and (g) greater than 100 milliSieverts for each year since 1979;
(2) if he will give a breakdown for Devonport dockyard of annual individual radiation exposure for Rolls-Royce 235W personnel in the bands of (a) nought to 10, (b) 10 to 20,(c) 20 to 30, (d) 30 to 40, (e) greater than 50, (f) greater than 70 and (g) greater than 100 milliSieverts for each year since 1979;
(3) if he will give a breakdown for Chatham dockyard of annual individual radiation exposure for Rolls-Royce personnel in the bands of (a) nought to 10, (b) 10 to 20,(c) 20 to 30, (d) 30 to 40, (e) greater than 50, (f) greater than 70 and (g) greater than 100 milliSieverts for each year since 1979;
(4) if he will give a breakdown for the Clyde submarine base at Faslane of annual individual radiation exposure for Rolls-Royce personnel in the bands of (a) nought to 10, (b) 10 to 20, (c) 20 to 30, (d) 30 to 40, (e) greater than 50, (f) greater than 70 and (g) greater than 100 milliSieverts for each year since 1979;
§ Mr. Kenneth CarlisleThe information requested by the hon. Member is a matter for Rolls-Royce and associates.
§ Mr. Andrew F. BennettTo ask the Secretary of State for Defence what is the distribution of total radiation exposure for Chatham dockyard workers in the ranges(a) nought to five milliSieverts, (b) five to 10, (c) 10 to 15, (d) 15 to 20, (e) 20 to 25, (f) 25 to 30, (g) 30 to 35, (h) 35 to 40, (i) 40 to 45, (j) 45 to 50, (k) greater than 50, (1) greater than 100, (m) greater than 200, (n) greater than 300, (o) greater than 400, (p) greater than 500, (q) greater than 600, (r) greater than 700 and (s) greater than 750 milliSieverts, in numbers and in terms of percentage of the overall work force.
§ Mr. Kenneth CarlisleA breakdown of cumulative radiation exposure for workers registered in DRPS's record-keeping system as working at Chatham dockyard, including those who have left MOD but whose last MOD establishment was Chatham, is shown in the table:
Dose range Number of persons Percentage of work force monitored 0–5 80 16.7 5–10 36 7.5 10–15 30 6.3 15–20 22 4.6 20–25 23 4.8 25–30 15 3.1 30–35 13 2.7 35–40 13 2.7 40–45 16 3.3 45–50 12 2.5 Greater than 50 (50–100) 83 17.3 100 (100–200) 83 17.3 200 (200–300) 38 7.9 300 (300–400) 13 2.7 400 (400–500) 2 0.4 500 (500–600) 1 0.2 600 (600–700) 0 0 700 (700–750) 0 0 750 0 0