放射物质 meaning in English

radiating matter
radioactive substance
radiogen

In the deep mantle the highest possible concentration of radioactive materials is limited by the condition demanding temperatures below the melting point .
在地幔深部，放射物质最高的可能浓度受溶点以下的温度条件所限制。
Unsealed radioactive substances . identification and certificate
非密封放射物质.标识和认证
Some chemical and radiological substances such as asbestos and radon also increase the risk of the cancer
另外，吸入某些化学及放射物质如石棉和氡亦会增加患肺癌的机会。
Article 31 . the discharge of radioactive substances from nuclear - powered vessels or vessels carrying such substances must be conducted in compliance with the provisions of article 19 of this law
第三十一条核动力船舶和载运放射物质的船舶，排放放射性物质，必须遵守本法第十九条的规定。