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当电子工业发现在陶瓷封装中存在α粒子发射以及它们对动态随机存取存贮器(RAM)和电荷耦合器件的影响时,封装材料立刻受到人们的注意。于是我们动手测定封装材料,确定哪一种是发射源,以便加以控制,使其有所减少以至消除α粒子的放射性。通过直接α粒子计数可对陶瓷、密封玻璃、金属化材料进行检验。业已发现所有这些材料都是α粒子的发射源。其中密封玻璃有最高的发射率,在2～74α/cm~2h之间;而陶瓷是最低的,在0.01～0.37α/cm~2h之间。此外,还报道了用于高氧化铝封装陶瓷制造中的17种材料的测量结果。其中粘土的α粒子发射率最高,在16～37α/cm~2h之间,而最主要的陶瓷成分——三氧化二铝发射率最低在0.15～0.66/cm~2h之间。尚未发现任何一种材料是没有α粒子发射的。
Encapsulation materials are receiving immediate attention when the electronics industry finds the presence of alpha particle emission in ceramic packages and their impact on dynamic random access memory (RAM) and charge-coupled devices. So we started to measure the encapsulation material to determine which one is the emitter so that we can control it to reduce it and even eliminate the radioactivity of alpha particles. Ceramics, sealing glass, metallized materials can be inspected with direct alpha particle counting. All of these materials have been found to be sources of alpha particles. Among them, the sealing glass has the highest emissivity, ranging from 2 to 74α / cm to 2h, while the ceramic is the lowest, ranging from 0.01 to 0.37α / cm to 2h. In addition, measurements of 17 materials used in the manufacture of high alumina packaged ceramics were also reported. Among them, the α-particle emissivity of clay is the highest between 16 ~ 37α / cm ~ 2h, while the lowest one of the most important ceramic component, alumina, is between 0.15 ~ 0.66 / cm ~ 2h. No material has been found to emit without alpha particles.