Honeywell International Inc.

Brett M Clark

Susan D Strothers

Janine K Kardokus

Jaeyeon Kim

Michael R Pinter

Nancy F Dean

Ronald H Fleming

Martin W Weiser

Michael J Bossio

James P Flint

Mark B Fery

Paul P Silinger

Wuwen Yi

Derek E Grove

Kevin R Terhaar

Ravi Rastogi

A method for removing lead-210 (Pb) from a metal, the method comprising determining aPb concentration in a metal to be refined; determining an amount of low alpha lead to be added to the metal to be refined from thePb concentration, the low alpha lead having aPb concentration below that of the metal to be refined; forming a doped metal mixture by adding the low alpha lead to the metal to be refined; refining the doped metal mixture to separate at least a portion of the lead in the doped metal mixture to form a refined metal having aPb concentration lower than that of the metal to be refined.

Isotope displacement refining process for producing low alpha materials

The invention includes solder materials having low concentrations of alpha particle emitters, and includes methods of purification of materials to reduce a concentration of alpha particle emitters within the materials. The invention includes methods of reducing alpha particle flux in various lead-containing and lead-free materials through purification of the materials. The invention also includes methods of estimating the fractionation of a low concentration of one or more alpha particle emitters during purification of a material.

Method of refining solder materials

A method for assessing an alpha particle emission potential of a metallic material. A metallic material is initially subjected to a secular equilibrium disruption process, such as melting and/or refining, to disrupt the secular equilibrium of the radioactive decay of one or more target parent isotopes in the material. A sample of the material is treated to diffuse target decay isotopes within the sample such that the measured alpha particle emission directly corresponds to the concentration or number of target decay isotope atoms within the entirety of the sample, enabling the concentration of target decay isotopes in the sample to be determined. The concentration of target parent isotopes in the material may then be determined from the concentration of target decay isotopes and time elapsed from the secular equilibrium disruption process, and may be used to determine a maximum alpha particle emission that the metallic material will exhibit.

Method for assessing an alpha particle emission potential of a metallic material

An electrorefining process is disclosed for producing high purity tin having reduced short-term and long-term alpha particle emissions and reduced lead levels. The process may use a mixed acidic electrolytic solution including at least a first electrolyte that provides sulfate ions in the mixed electrolytic solution, such as sulfuric acid, and a second electrolyte that provides halide ions in the mixed electrolytic solution, such as hydrochloric acid.

Metal refining process using mixed electrolyte

Method for assessing an alpha particle emission potential of A metallic material

The invention includes a method of detecting impurities in a metal-containing article. A portion of metal material is removed from a metal article and is solubilized in an acid or base-comprising liquid to produce a liquid sample. The liquid sample is subjected to an incident laser beam and light scattered from the sample is detected. The invention includes a method of analyzing a physical vapor deposition target material. A portion of target material is removed from the target and is rinsed with an acid-comprising solution. The portion of target material is dissolved to produce a liquid sample. The sample is subjected to an incident laser beam and scatter of the laser beam is detected to determine the number of particles present in the sample within a particular size range.

Liquid-particle analysis of metal materials

Methods of refining lead-containing materials

Growing community of inventors

Spokane Valley, WA, United States of America

Brett M Clark