Concentrations of 137Cs and 40K in Edible Mushrooms Collected in Japan and Radiation Dose Due to Their Consumption

Abstract

To estimate radiocesium intake due to eating mushrooms, about 100 samples belonging to 11 species were analyzed to establish representative values for 137Cs and 40K in common edible mushrooms available in food markets. Concentration ranges were <0.047-39 Bq kg(-1) (wet wt) for 137Cs and 30-210 Bq kg(-1) (wet wt) for 40K. The median concentrations were 1.3 Bq kg(-1) (wet wt) for 137Cs and 97 Bq kg(-1) (wet wt) for 40K. The 137Cs concentrations in cultivated mushrooms were markedly lower than those in wild mushrooms. The annual intake of 137Cs per person through mushrooms was calculated (using analytical results and food consumption data in Japan) to be 6.0 Bq for 137Cs, which is about 32% of the total dietary intake of this nuclide. The effective dose equivalent of 137Cs through mushroom was estimated to be 7.7 x 10(-8) Sv (range estimated from the standard deviation: 3.0 x 10(-8) - 2.0 x 10(-7)).

Determination of Natural Radionuclide in Pig Production Chain in Macedonia by Gamma Spectrometry

“…Their activity concentration ranged from 73.39±9.109 in liver and kidney up to 298.80±38.51 in feeds. Similar fundings were published by Ban-nai et al (1997), Ventiru and Sordi (1999) and Badran et al (2003). Akinloye et al (1999) reported that the pork meat has the highest mean activity concentration of 40 K in comparison with beef and poultry meat.…”

Distribution of natural radionuclides and 137Cs in soils of southwestern Ontario

“…The fate of Chernobyl-derived 137 Cs is a concern in forest ecosystems of Europe where some types of vegetation such as mushrooms have a significant affinity for bioaccumulating 137 Cs (Pietrzak-Flis et al 1996). Therefore foraging animals may be accumulating the radionuclide into their bodies with a potential for transfer to humans through the consumption of these animals (Ban-nai et al 1997).…”

Observed distribution of radiocaesium contamination in shiitake lots and variability of test results

“…Generally, the capacity of mushrooms to accumulate metallic elements from their substrate is species specific and highly variable (Falandysz & Borovička 2013). The degree of radiocaesium accumulation to certain species is dependent on multiple factors such as the habitat of mycelium, time from the disaster and the type of nutritional mechanism (Grüter 1971;Ban-nai et al 1997;Mietelski et al 2010;Guillén & Baeza 2014). Ban-nai et al (2004) analysed mushrooms brought into the Japanese market in 2000.…”

“…Cultivation in bed-log requires at least 1.5 years, much longer than mushroom bed cultivation, which requires no longer than 6 months. Shiitake cultivated on bedlogs (log-shiitake) accumulate significantly more radiocaesium than those cultivated on mushroom beds, presumably because of the long cultivation period (Ban-nai et al 1997(Ban-nai et al , 2004. Since the Fukushima-Daiichi nuclear power plant accident, the violation rate of log-cultivated shiitake has exceeded that of other foodstuffs (Renaud et al 2013;MHLW 2014a).…”