Table 1: Individual dose groups, thyroid cancer incidence rates
and thyroid doses based on UNSCEAR 2020/2021 for 10-year-old children.
|
Dose group |
Incidence /10,000 PY |
Mean thyroid dose /GyUN2021
(a) BLD=0 * |
Mean thyroid dose /GyUN2021
(b) BLD=4.45 mGy |
Corresponding
dose in Chernobyl /Gy (c) |
Conversion
coefficient k = (c)/(a) |
Conversion
coefficient k = (c)/(b) |
|
high (≥2 mSv) |
3.02 |
0.0173 |
0.0218 |
1.46 |
86 |
67 |
|
middle (1-2 mSv) |
1.99 |
0.0101 |
0.0146 |
0.95 |
95 |
65 |
|
low (<1 mSv) |
1.12 |
0.0034 |
0.0079 |
0.52 |
153 |
67 |
|
Weighted average by No of examinee |
1.56 |
0.0067 |
0.0112 |
0.74 |
110 |
66 |
*Converted
thyroid dose (Gy) of the third column in (Table 1) of Reference [1]: “0.0197,
0.0115, 0.0038, 0” were thyroid doses for 1-year-old infants. They should be
corrected for 10-year-old children as “0.0173, 0.0101, 0.0034, 0” as in this
(Table 1), third column. The analyses and Figures in [1] were based on thyroid
doses for 10-year-old children.