| Summary: | We compare the specific activities of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>137</mn></msup></semantics></math></inline-formula>Cs and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>40</mn></msup></semantics></math></inline-formula>K in stipes and caps of three different common mushroom species (<i>Xerocomus badius</i>, <i>Russula ochroleuca</i> and <i>Armillariella mellea</i>) measured at the Czech Chernobyl hot spot in the Opava area (Silesia) and at a low-exposed site at the Beskydy mountains in 2011. The highest values of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>137</mn></msup></semantics></math></inline-formula>Cs were found in caps of <i>Xerocomus badius</i> and <i>Russula ochroleuca</i> in the Opava area (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>11.8</mn></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>8.77</mn></mrow></semantics></math></inline-formula> kBq/kg, respectively). The source of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>137</mn></msup></semantics></math></inline-formula>Cs was verified by the measurement of the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>134</mn></msup></semantics></math></inline-formula>Cs/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>137</mn></msup></semantics></math></inline-formula>Cs ratio. Based on our results, we estimate an effective dose per year due to radiocaesium intake in the two investigated areas for <i>Xerocomus badius</i>, one of the most popular edible mushrooms in the Czech Republic. In 2011, the effective dose reached the maximum value of 0.102 mSv in the Opava area and 0.004 mSv at the low-exposed site at the Beskydy mountains. Therefore, it does not represent a significant risk for public health.
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