Title: Improved quantitation of gamma and X-ray emitting isotopes
Application Number: 94194455 Application Date: 1994.10.12
Publication Number: 1137239 Publication Date: 1996.12.03
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: A61K51/04;C12Q1/68;G01N23/00;G01N33/534;G01N33/569;G01T1/00;G01T1/161;G01T1/20;G21H5/02;H01J47/00;H0
Applicant(s) Name: Biautres Co. Address:
Inventor(s) Name: Andrzej K. Drukier
Attorney & Agent: FAN MINGE
Abstract:
    For isotopes decaying by capture of an inner shell electron by the nucleus, coincident emission of X-ray and gamma photons may occur. The X-ray results from the drop of an outer shell electron to fill the S shell. The gamma results from the transition of the excited daughter nucleus to a lower energy state. The invention disclosed is a Coincident Gamma and X-ray Detector (CGXD) which achieves extraordinary background rejection by a synergistic combination of coincident counting and other background suppresion measures. Whereas the background registred by single gamma counters is of the order of 20-40 counts per minute, a CGXD optimized for the electron capture radioisotope I
Time: 6