標 本 名: | ジルコン (Zircon)
| 化学組成: | ZrSiO4 | サ イ ズ: | | 重量: | | 透明: | | 数量: | | 産地: | Gem gravels around Ratnapura, Ratnapura District, Sabaragamuwa Province , スリランカ (Sri Lanka) | This fellow is radioactive due to some incorporated Thorium or Uranium atoms, zircons usually contain 1 to 20,000 ppm of uranium and from approximately0.5 to 5,000 ppm of thorium . In this case the radiation is around 10 times higher than the background around 2,5 µSv/h . Fully intact specimen !
| 
