182 Health Physics August 2010, Volume 99, Number 2 Table 14. Cumulative radiation absorbed doses (mGy) to four organs of representative persons by birth year (<1930 through 1968) from chronic intakes of residual radioactivity in the environment from fallout (all values rounded to two significant digits). Doses for Utrik and Rongelap communities account for relocations. Majuro residents Kwajalein residents Birth year RBM Thyroid Stomach Colon RBM Thyroid Stomach Colon 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 0.98 0.98 0.98 0.98 0.98 0.98 0.98 0.98 1.0 1.0 1.0 1.0 1.0 1.1 1.2 1.3 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.2 1.1 1.2 0.70 0.40 0.27 0.21 0.17 0.14 0.12 0.11 0.10 0.086 0.076 0.068 0.056 0.045 0.76 0.76 0.76 0.76 0.76 0.76 0.76 0.76 0.78 0.78 0.78 0.78 0.78 0.90 0.98 1.0 1.0 1.0 1.1 1.1 1.0 1.0 1.0 1.0 0.93 0.98 0.57 0.31 0.20 0.16 0.13 0.11 0.10 0.087 0.079 0.072 0.065 0.059 0.048 0.039 0.75 0.75 0.75 0.75 0.75 0.75 0.75 0.75 0.77 0.78 0.77 0.78 0.78 0.85 0.89 0.90 0.91 0.91 0.97 0.98 0.96 0.95 0.94 0.90 0.83 0.87 0.52 0.30 0.21 0.17 0.14 0.12 0.11 0.10 0.088 0.080 0.073 0.066 0.054 0.044 0.99 0.99 0.99 0.99 0.99 0.99 0.99 0.99 1.0 1.0 1.0 1.0 1.0 1.1 1.2 1.3 1.3 1.3 1.3 1.4 1.3 1.3 1.3 1.3 1.2 1.2 0.75 0.48 0.35 0.29 0.25 0.22 0.19 0.18 0.16 0.14 0.13 0.12 0.10 0.081 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.8 1.8 1.8 1.8 1.8 1.9 2.0 2.1 2.2 2.2 2.2 2.2 2.2 1.9 1.8 1.7 1.7 1.6 1.7 1.0 0.61 0.41 0.32 0.26 0.22 0.19 0.17 0.15 0.13 0.12 0.11 0.087 0.070 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.4 1.4 1.4 1.4 1.4 1.4 1.6 1.7 1.7 1.7 1.7 1.8 1.8 1.6 1.5 1.4 1.4 1.3 1.4 0.82 0.47 0.31 0.24 0.20 0.17 0.15 0.14 0.12 0.11 0.10 0.092 0.076 0.061 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.4 1.4 1.4 1.4 1.4 1.5 1.6 1.6 1.6 1.6 1.6 1.7 1.5 1.4 1.3 1.3 1.2 1.2 0.76 0.47 0.33 0.26 0.22 0.19 0.17 0.15 0.14 0.13 0.11 0.10 0.085 0.069 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.8 1.8 1.8 1.8 1.8 1.8 2.0 2.2 2.2 2.2 2.2 2.3 2.3 2.1 2.0 1.9 1.8 1.8 1.8 1.1 0.74 0.55 0.45 0.38 0.34 0.30 0.28 0.25 0.23 0.21 0.19 0.15 0.13 For the Utrik and Rongelap communities, the dose to RBM from fallout, as mentioned, was less than from the dose from natural radioactivity; however, the fallout- related equivalent doses to the other organs (thyroid, stomach wall, and colon) exceeded the diet-related equivalent doses to those organs andtissues from natural radioactivity. In the case of these two population groups, the thyroid equivalent dose was far greater from intakes of fallout radionuclides than from intakes of naturally- occurring *!°Pb and *'°Po (40 to nearly 400 times larger). The combined Utrik and Rongelap populations composed about 3% of the population alive during the testing years. Estimation of uncertainties There are numerous sources of uncertainty in the acute and chronic dose estimates presented here, many of which are difficult to quantify. Because of the various types and sources of data used in the reconstruction, the wide variety of sub- models used, and the many assumptions and interpolations required, numerical determination of the overall uncertainty in doses for each atoll and age group is difficult and involves considerable subjective judgment. In this section, the uncertainties in the total internal dose received by each population group in each year from all tests in that year are crudely quantified. The dosimetric uncertainties for the population groups exposed on the three northern atolls (Rongelap, Ailinginae, Rongerik), for Utrik, and for the mid-latitude and southern latitude atolls (see Fig. 2 in Simon et al. 2010) are considered in turn. Population groupsin the northern latitudes. The doses received by the Rongelap Island community are used here to