Iodine-129 measurements in soil samples from Dolon village near the Semipalatinsk nuclear test site.
Dolon village, located about 60 km from the border of the Semipalatinsk nuclear test site, is known to be heavily contaminated by the first USSR atomic bomb test in August 1949. Soil samples around Dolon were taken in October 2005 in an attempt to evaluate internal thyroid dose arising from incorporation of radioiodine isotopes (mainly (131)I). Iodine-129 in soil was measured by using the technique of accelerator mass spectrometry. The (129)I/(127)I atom ratios measured were in the range from 3.3 x 10(-9) to 3.3 x 10(-7). These values were within the range of the current background level ( approximately 10(-9) to 10(-7)) in the environment, including contributions from the global fallout of atmospheric nuclear tests and local fallout of nuclear facilities. The (129)I atom accumulated level in soil ranged from 1.28 x 10(13) to 1.59 x 10(14) atoms m(-2), the average (8.0 x 10(13)) of which was higher than the background level of (2-5) x 10(13). From the relationship between (129)I and( 137)Cs (corrected for background and decay from 1949 to 2005) accumulated levels, the background level of (129)I and the (129)I/(137)Cs ratio around Dolon were estimated to be (6.4 +/- 0.4) x 10(13) atoms m(-2) and 0.25 +/- 0.16, respectively. This (129)I/(137)Cs ratio is almost similar to the fission yield ratio for (239)Pu fast fission (0.24).
Endo
Satoru
S
Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan. endos@hiroshima-u.ac.jp
Tomita
Junpei
J
Tanaka
Kenichi
K
Yamamoto
Masayoshi
M
Fukutani
Satoshi
S
Imanaka
Tetsuji
T
Sakaguchi
Aya
A
Amano
Hikaru
H
Kawamura
Hidehisa
H
Kawamura
Hisao
H
Apsalikov
Kazbek N
KN
Gusev
Boris I
BI
Whitehead
Neil E
NE
Shinkarev
Sergey
S
Hoshi
Masaharu
M
D002588:Cesium Radioisotopes / Q000032:analysis; D007457:Iodine Radioisotopes / Q000032:analysis*; D007623:Kazakhstan; D013058:Mass Spectrometry; D009689:Nuclear Warfare; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
D002588:Cesium Radioisotopes; D007457:Iodine Radioisotopes; D012990:Soil Pollutants, Radioactive