Patricia A Mcfarland

US Patent:

44568231, Jun 26, 1984

Filed:

Nov 18, 1981

Appl. No.:

6/322442

Inventors:

Robert C. McFarland - Atlanta GA
Patricia A. McFarland - Atlanta GA

International Classification:

G01D 1800
G12B 1300

US Classification:

2502521

Abstract:

A mixed gamma emitting gas standard in the form of a multiple isotope standard in a glass sphere which can be used to calibrate a gamma spectrometer system for gas counting in a wide energy range and without the need for any additional standards. Total and partial transfers of gas standard material to counting containers without leakage is enabled. The mixed gas standard is contained in a spherical vial equipped with ground glass stopcocks and a septum port in one tubular arm separated from the spherical vial by one stopcock. A gas transfer syringe, venting needle, assorted septa, and a length of hose are included with the spherical vial assembly to enable accurate volumetric transfers to several different gas counting geometries.

US Patent:

44302584, Feb 7, 1984

Filed:

May 28, 1981

Appl. No.:

6/267802

Inventors:

Robert C. McFarland - Atlanta GA
Patricia A. McFarland - Atlanta GA

International Classification:

G21G 404

US Classification:

252644

Abstract:

Method of producing liquid equivalent solid gamma ray calibration standards comprising the steps of adding a first organic solvent to a calibrated aqueous solution of radioactive material, either in the form of a single isotope or mixed isotopes, to form a first solution; mixing the first solution with a polymerizible resin dissolved in a second organic solvent together with a hardening catalyst to form a second solution; and curing the second solution. With isotope standards requiring highly acidic conditions, a stabilizing agent is added to the first solvent to complex with metal and hydrogen ions so as to prevent plate-out.