有哪些信誉好的足球投注网站Radiocaesium Activity Concentrations in Potatoes in Croatia after the Chernobyl Accident an.pdf
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Radiocaesium Activity Concentrations in Potatoes in Croatia after the Chernobyl Accident an
1
Radiocaesium Activity Concentrations in Potatoes in Croatia after the
Chernobyl Accident and Dose Assessment
Zdenko Frani?1*, Branko Petrinec1, Gordana Marovi?1 and Zrinka Frani?2
1 Radiation Protection Unit, Institute for Medical Research and Occupational Health, Zagreb,
Croatia
2 Medical School, University of Zagreb, Zagreb, Croatia
ABSTRACT
Systematic investigations of 137Cs and 134Cs activity concentrations in potatoes
(Solanum tuberosum) for the post-Chernobyl period (1986-2005) in the Republic of Croatia
are summarized. The correlation between 137Cs activity concentrations in fallout and potatoes,
has been found to be very good, the correlation coefficient being r2=0.88 with P(t) 0.001 for
18 degrees of freedom. As the radiocaesium levels in potatoes decreased exponentially, the
mean residence time of 137Cs in potatoes was estimated by fitting the measured activity
concentrations to the exponential curve. The mean residence time was found to be 6.8 ± 1.1
years, the standard deviation being estimated by the Monte Carlo simulations.
The initial observed 134Cs:137Cs activity ratio in potatoes has been found to be quite
variable, but slightly lesser than theoretically predicted value of 0.5, calculated by applying
the known inventory of these radionuclides in the Chernobyl reactor to the equation for the
differential radioactive decay. This can be explained by presence of the pre-Chernobyl 137Cs
in soil that originated from nuclear fallout.
The annual effective doses received by 134Cs and 137Cs intake due to consumption of
potatoes estimated for an adult member of Croatian population were found to be very small,
as the per caput dose for the entire 1986 – 2005 period was calculated to be about 2.9 μSv,
134Cs accounting approximately for 1/3 of the entire dose. Therefore, after the Chernobyl
accident consumption of potatoes was not the critical pathway for human intake of
radiocaesium from the environment in Croatia.
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