All shipments must include a certificate confirming the materials are nonradioactive before customs clearance.

所有貨物在通關前都必須附上證明材料無放射性的證書。

The lab manager explained in her email that the new tracer dye is completely nonradioactive.

實驗室經理在電子郵件中說明，新的示蹤染劑完全無放射性。

Customers asked whether the imported granite countertops were nonradioactive, so we sent the test results.

顧客詢問進口花崗岩檯面是否無放射性，所以我們寄上了檢測結果。