| 摘要 |
PROBLEM TO BE SOLVED: To make clear the phenomenon of the generation of α rays in indium and an indium-containing alloy and further to provide high purity indium with reduced quantity of α rays which can be adapted to a required material since, in the recent semiconductor device, density and volume are increased, the risk of occurrence of soft errors has been increased by the influence of α rays from a material in the vicinity of a semiconductor chip, and particularly, the request for the increase of purity to a solder material or indium used closely to the semiconductor device is strong, and further, the material with reduced α rays is required.SOLUTION: The indium is characterized in that the quantity of α rays in a sample after being subjected to melting and casting is ≤0.002 cph/cm. |
