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Cu ball

  • US 9,668,358 B2
  • Filed: 12/06/2012
  • Issued: 05/30/2017
  • Est. Priority Date: 12/06/2012
  • Status: Active Grant
First Claim
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1. A Cu ball characterized in that the Cu ball contains a Pb content of 1 ppm or more, and has a sphericity of 0.95 or more, a purity from 99.9% or more to 99.995% or less, an α

  • dose of 0.0200 cph/cm2 or less, a U content of 5 ppb or less, a Th content of 5 ppb or less, and a diameter in the range of 1 μ

    m through 1000 μ

    m.

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