埼玉県衛生研究所Saitama Prefectural Institute of Public Health ◇ 355–0133 埼玉県比企郡吉見町江和井410–1 ◇ 410–1 Ewai, Yoshimi-machi, Hiki-gun, Saitama Pref. 355–0133, Japan
ナシ（豊水及び幸水）について，摘果果実を用いた成熟果実の放射性セシウム濃度の推定・安全性評価の可能性について検討するため，摘果果実と成熟果実の放射性セシウム濃度について調べた。摘果果実及び成熟果実の放射性セシウム濃度は，品種によって大きな違いはみられなかった。成熟果実の137Cs濃度は，全体及び可食部ともに摘果果実の137Cs濃度の約1/4であり，摘果果実の濃度から成熟果実の濃度を推定できることがわかった。
To investigate the predictability of radiocaesium concentrations in the Japanese ripe pear fruits (Hosui and Kosui) based on those in the thinned-out pear fruits before the harvest, radiocaesium concentrations in thinned-out and ripe pear fruits were measured by γ-ray spectrometry. There was no significant difference in 137Cs concentrations of thinned-out and ripe pear fruits between Hosui and Kosui. The concentrations of 137Cs in ripe pear fruits (whole and flesh) were about quarter of those in thinned-out pear fruits. This finding suggests that the radiocaesium concentrations in ripe pear fruits could be predicted from those in thinned-out pear fruits.
Key words: pear; caesium-134; caesium-137; thinned-out fruit; prediction of ripe fruit radioactive caesium concentration
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