Apparatus and a method for measuring the activity of radioactive samples containing a multiple of radioactive isotopes
US5134294A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1991 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Feb 6, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01T1/204
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Liquid scintillation counter includes a memory having stored spectra of known counting efficiencies and known levels of quench, for the isotopes to be meansured. A device extracts from the spectra, using the determined quench level value for each of the N isotopes, a reference spectrum representing a pure isotope spectrum at the determined quench level. A device determines for each extracted reference spectrum a factor by which the extracted reference spectrum is to be multiplied in order to fit the sum of the multiplied reference spectra to the sample spectrum. Each factor is directly related to the amount of each isotope in the sample. A method for use in a liquid scintillation counter includes, first extracting, from stored spectra of known counting efficiencies and known levels of quench for each of the N isotopes, a reference spectrum representing a pure isotope spectrum at the determined quench level and second, determining, for each extracted reference spectrum, a factor by which the extracted reference spectrum is to be multiplied in order to fit the sum of the multiplied reference spectra to the amount of each isotope in the sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.