| The onsen eggs of Iizaka hot springs in Fukushima City, Fukushima Prefecture are called radium eggs as it is the first onsen in Japan at which the presence of radium was detected in the water. |
福島県福島市の飯坂温泉の温泉卵は、この温泉で日本で初めてラジウムの存在が確認されたことに因み、ラジウム玉子（ラヂウム玉子）と呼ばれる。 |