The Scottish Environment Statistics - 1998

7. RADIOACTIVITY

Table 7.5 Environmental monitoring by operator - sea discharges, 1988-1996 Fish and shellfish monitoring Site Material Nature of Annual mean concentration, becquerels per kilogram (wet) radioactivity 1988 1989 1990 1991 1992 1993 1994 1995 1996 Chapelcross Flounders Strontium 90 0.13 0.1 <0.10 <0.10 <0.10 <0.10 0.18 0.10 0.046 Caesium 134 1.4 0.93 <0.18 <0.23 <0.18 <0.23 0.10 0.13 nd Caesium 137 96 67 38 35 34 44 32 25 29 Shrimps Strontium 90 0.18 <0.10 <0.10 <0.13 <0.10 <0.10 0.13 0.38 0.092 Caesium 134 0.33 0.28 <0.10 <0.10 <0.10 <0.10 0.10 0.10 nd Caesium 137 22 17 13 10 7.3 9.8 9.8 6.5 12 Sea Trout Strontium 90 0.2 0.1 <0.10 <0.10 <0.10 <0.10 0.10 0.10 na Caesium 134 1 0.25 <0.20 0.20 <0.20 <0.15 0.10 0.10 nd Caesium 137 29 21 12 10 14 10 6 0.90 7.7 Dounreay Winkles Total alpha na na na na na na na na na Cobalt 60 <4.4 <3.1 <3.3 <10 <10 <10 <10 <10 0.76 Strontium 90 <0.1 <0.1 <0.1 <0.4 2 na 1 na na Zirconium 951 <80 <43 <50 <20 <20 <20 <20 <20 nd Ruthenium 1062 <69 <55 <56 <55 <50 <50 <50 <50 6.8 Silver 110 160 75 <66 39 <28 <12 19 16 26 Antimoney 125 nd nd nd nd na na na na nd Caesium 137 <5.0 <8.8 <10 <10 <10 <10 <13 <10 0.21 Cerium 144 <50 <30 <30 <50 <50 <50 <17 <50 0.64 Plutonium 238 na na na 0.06 <0.06 <0.13 0.16 0.1 0.13 Plutonium 239 + 240 na na na 0.18 0.13 0.31 0.45 0.29 0.48 Plutonium 241 na na na <1 <6 5 5 2.2 na Americium 241 na na na 0.17 <0.12 0.16 <0.15 0.22 0.23 Curium 242 na na na <0.05 <0.04 <0.04 <0.04 <0.04 0.0091 Curium 243 + 244 na na na <0.04 <0.04 <0.04 <0.04 <0.04 0.0025 Hunterston Fish Total beta 120 100 ns ns 110 70 100 95 na Caesium 137 13 9.6 ns ns 8 5 6 5 na Shellfish3, 4 Total beta 60 7 87 110 63 40 45 75 na Caesium 137 6 3 3.7 3 2 1 1.5 2.5 na Torness Winkles Total beta 87 55 58 58 44 110 64 51 58 Cobalt 60 nd nd nd 0.34 0.5 nd 0.14 nd 0.13 Ruthenium 106 0.86 nd nd nd nd nd nd nd na Silver 110 2.3 0.51 nd 0.04 0.32 0.75 0.96 0.2 0.54 Caesium 134 nd <0.1 nd nd nd nd nd nd na Caesium 137 0.52 0.49 0.31 <0.54 <0.33 <0.57 <0.64 <0.43 0.24 Fish (cod) Total beta 83 92 100 100 91 116 105 117 na Cobalt 60 nd nd nd nd nd nd nd nd nd Ruthenium 106 nd nd nd nd nd nd nd nd na Silver 110 nd nd nd nd nd nd nd nd nd Caesium 134 0.15 <0.1 nd nd nd nd nd nd na Caesium 137 1.9 1.5 2.2 6.3 0.7 0.6 0.6 0.9 1.3 Sources: HM Industrial Pollution Inspectorate (up to 31/3/96) and the RIFE report (from 1/4/96) ns: not sampled nd: not detected na: not analysed 1 Includes any niobium 95 present 2 Includes any ruthenium 193 presemt 3 Samples were available during July-August only in 1991. 4 During the fourth quarter of 1992, lobster was sampled in place of winkles.