As to residualradioactivity in man-improved gems from nature more protection and inspection should be enhanced.
对目前一些天然宝石的人工改善品中会残留放射性问题，指出要加强防护监测。
2
Emergency batteries worked for 10 more hours but when they ran out, an alternative power source had still not been connected. Residualradioactivity in the core continued to build up heat.