Investigation of radiocesium concentration in shiitake (Lentinula edodes) mushroom logs by nondestructive inspection methods. Part 2.

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  • 非破壊検査装置によるシイタケ原木中の放射性セシウム濃度の調査（2 報）
  • 非破壊検査装置によるシイタケ原木中の放射性セシウム濃度の調査(2報)栃木県内3か所の原木林原木の非破壊検査装置による放射性セシウム濃度の測定
  • ヒハカイ ケンサ ソウチ ニ ヨル シイタケ ゲンボク チュウ ノ ホウシャセイ セシウム ノウド ノ チョウサ(2ホウ)トチギ ケンナイ 3カショ ノ ゲンボクリン ゲンボク ノ ヒハカイ ケンサ ソウチ ニ ヨル ホウシャセイ セシウム ノウド ノ ソクテイ
  • －栃木県内3 か所の原木林原木の非破壊検査装置による放射性セシウム濃度の測定－
  • － Measurements of radiocesium in shiitake mushroom logs in three areas of Tochigi Prefecture by nondestructive inspection methods －

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Abstract

We investigated the radiocesium (Cs-134 + Cs-137) concentration in trees (Quercus serrata) used in shiitake mushroom log cultivation in Tochigi Prefecture (where the concentration of radiocesium differs among three areas) by nondestructive inspection methods. Most of the logs in the Sakura city area exceeded the index value (50 Bq/kg or less at 12% log water content as specified by the Forestry Agency of Japan); therefore, trees of this area cannot be used as shiitake mushroom logs. On the other hand, all logs in the Ichikai town area were below the index value. Furthermore, 9.4% of logs in the Utsunomiya city area exceeded the index value. The surfaces of logs from Utsunomiya were rinsed, and then the radiocesium concentration of the rinsed logs was measured. An average 20 Bq/kg decrease was observed for all logs. Based on these test results, we calculated the reliable minimum sampling number (to determine whether logs meet a specified value allowing their use for shiitake cultivation) from a t-distribution (small sample theory method). With a confidence level of 95%, 202 logs need to be removed for sampling from the Sakura city set and 188 logs need to be removed for sampling from the Utsunomiya city set.

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