Age (y) <1 1 5 10 15 >17 90Sr 58 110 170 230 230 230 137Cs 310 620 620 680 830 930 90Sr 52 100 160 210 210 210 137Cs 130 270 270 300 360 400 Int. J. Environ. Res. Public Health 2009, 6 189 Table 6. Average annual intakes of 90Sr and 137Cs for populations in Muslyumovo and Brodokalmak in 1999 (Bq y-1). Data are based on privately produced food (adapted from [25]). Muslyumovo Brodokalmak Table 7. Average individual internal dose to the population in Muslyumovo and Brodokalmak in 1999, and accumulated up to 1999, depending on age (mSv) (adapted from [25]). Age (1999 ) <1 1 5 10 15 17-18 18-48 Muslyumovo Brodokalmak Accumulated up to Accumulated up to Intake in 1999 Intake in 1999 1999 1999 90Sr 137Cs Total 90Sr 137Cs Total 90Sr 137Cs Total 90Sr 137Cs Total 0.00022 0.0065 0.0067 - - - 0.00042 0.013 0.013 0.00048 0.015 0.016 0.0004 0.0057 0.0061 0.0002 0.0027 0.0029 0.0034 0.068 0.071 0.00056 0.012 0.013 0.0032 0.030 0.033 0.0004 0.0065 0.0070 0.0087 0.086 0.095 0.00060 0.015 0.016 0.0080 0.038 0.046 0.0005 0.0051 0.0056 0.012 0.17 0.18 0.00030 0.029 0.029 0.011 0.074 0.085 0.0004 0.013 0.013 0.014 0.24 0.25 0.00032 0.036 0.036 0.012 0.10 0.11 0.0002 0.016 0.016 0.042 1.0 1.1 0.00032 0.036 0.036 0.039 0.44 0.48 0.0002 0.016 0.016 The internal dose was not estimated for the group using the sanitary zone for food gathering or pasture, but the author gives the assumption that this critical group would have received doses about three times higher than the stated average. Individual internal doses to the population in Brodokalmak are approximately half of the doses received by Muslyumovo residents in this assessment; annual individual internal doses being in the range 10-30 µSv in Muslyumovo and 7-15 µSv in Brodokalmak. The total estimated doses to the population in Muslyumovo and Brodokalmak in 1999, and accumulated up to 1995, are given in Table 8 [25]. For comparison, predicted average annual equivalent external doses in 1999 for children, teenagers and adults in Muslyumovo and Brodokalmak were also calculated. External doses were estimated for normal activity, not using the sanitary zone, and for additional external exposure due to activities within the sanitary zone such as the gathering of wood and hay, linen washing, keeping cattle and waterfowl on the floodplains and especially fishing and recreation by and on the water. In this early assessment, the contribution of the external dose to the total dose is about 90 %.