Liquid scintillation counter for measuring the activity of radioactive samples containing a multiple of radioactive isotopes
US4918310A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Nov 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01T1/204
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In a liquid scintillation counter the light output from a liquid scintillation sample containing radioactive isotopes of unknown activity is measured by means of a detector. A pulse height analyzer having discriminators that are combined to define pulse height windows, is connected to the detector for measuring and temporarily storing count rates for each of the windows. Moreover, there are means for determining a value for the quench level of the sample. According to the invention the number of pulse height windows is at least N+1, when the number of isotopes is N,N being .gtoreq.2. There are memory means for storing for each of said windows representations of counting intensities determined by measuring calibration samples of each isotope at different levels of quench. Moreover, there are means for extracting from said stored representations a counting intensity for each window and each isotope on the basis of said determined quench level value, and means for determining for each isotope a factor by which the extracted counting intensities are to be multiplied in order to fit the sum of the extracted counting intensities to the count rates measured for the sample in each window, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.