Low Alpha ：
在封装材料，半导体材料中微量元素会释放出微量α射线，导致封装记忆体失忆（丢失数据）或导致中央处理器发生软错误（死机），要求封装材料做到α射线辐射量低于Low Alpha 标准，或低于Ultra Low Alpha 标准
In package materials, trace elements in semiconducting materials emit trace amounts of alpha rays,causing the package memory to fail (lost data) or causing the central processor to suffer soft errors (crash)。The package material is required to achieve alpha ray radiation to a minimum of Low Alpha. Standard, or lower than Ultra Low Alpha standard。
Low Alpha < 0.02 cph/cm²
Ultra Low Alpha < 0.002 cph/cm²