Liquid scintillation spectrometry system for sample analysis
阅读：615发布：2023-05-17
专利汇可以提供Liquid scintillation spectrometry system for sample analysis专利检索，专利查询，专利分析的服务。并且A liquid scintillation spectrometer system includes several discriminator channels and a single amplification chain consisting of several pre-adjusted linear amplifiers providing, for example, three pre-adjusted ranges in the gain ratios of 1, 10, 100. Thus 32P can be counted in a channel with a gain of 1 and tritium can be counted in a channel with a gain of 100. A range switch proceeds each pulse height analyzer permitting any isotope to be counted in any channel. In an alternative system, similar in principle, signals are taken from several dynodes of the photomultipliers, for example the ninth dynodes, the 11th dynodes and the 13th dynodes.，下面是Liquid scintillation spectrometry system for sample analysis专利的具体信息内容。
1. A spectrometer system for measuring the energy of decay events of n different radioisotopes having different energy spectra and contained in samples, comprising : detector means responsive to decay events occuring in a sample for producing electrical pulses whose amplitude is in direct relation with the energy of the originating beta decay events, means for amplifying said electrical pulses comprising a plurality of linear amplification stages in series aiding relation each providing a predetermined amplification gain, and at least n counting channels each having : counting means, pulse height discriminator means for passing only a selected amplitude band of said electrical pulses to said counting means, and operator controlled selector means for connecting the input of said pulse height discriminator to one selected of said amplification stages.
1. A spectrometer system for measuring the energy of decay events of n different radioisotopes having different energy spectra and contained in samples, comprising : detector means responsive to decay events occuring in a sample for producing electrical pulses whose amplitude is in direct relation with the energy of the originating beta decay events, means for amplifying said electrical pulses comprising a plurality of linear amplification stages in series aiding relation each providing a predetermined amplification gain, and at least n counting channels each having : counting means, pulse height discriminator means for passing only a selected amplitude band of said electrical pulses to said counting means, and operator controlled selector means for connecting the input of said pulse height discriminator to one selected of said amplification stages.
2. A liquid scintillation counting system for measuring the energy of beta decay events of n different radioisotopes having different energy spectra and contained in liquid samples which also contain scintillator means which convert the energies of beta decay events in a sample into light energy pulses, comprising : detector means responsive to said light energy pulses for producing electrical pulses whose amplitudes are in direct relation with the energies of the originating beta decay events, amplifier means comprising a plurality of linear amplification stages in series aiding relation, each providing a predetermined amplification gain, and at least n counting channels each having : counting means, pulse height analyzing means for passing only a selected amplitude band of pulses to said counting means, and operator controlled selector means for connecting the input of said pulse height analyzing means to the output of one selected of said amplification stages.
3. A symmetrical liquid scintillation system according to claim 2, wherein said detector means comprise a plurality of photo multiplier tubes, said system additionally including means for summing the electrical pulses from said phototubes prior to amplification thereof and means in each of said counting channels for coincidence gating the pulses received from said plurality of phototubes prior to counting them.
4. A liquid scintillation counting system for measuring the energy of beta decay events of n different radioisotopes having different energy spectra and contained in liquid samples which also contain scintillator means which convert the energies of beta decay events in a sample into light energy pulses, comprising detector means responsive to said light energy pulses for producing electrical pulses whose amplitudes are in direct relation with the energies of the orginating beta decay events, amplifier means comprising a plurality of linear amplIfication stages in series aiding relation, each providing a predetermined amplification gain, and at least n counting channels each having: counting means, pulse height analyzing means for passing only a selected amplitude band of pulses to said counting means, and operator controlled selector means for connecting the input of said pulse height analyzing means to the output of one selected of said amplification stages, wherein said detector means and amplifier means consist in a plurality Of identical photomultiplier tubes each having a plurality of dynodes corresponding to increasing amplification gains and wherein said selector means are constructed to connect the input of said pulse height analyzer to a selected one of several summation circuit each of which is fed by corresponding predetermined dynodes of said phototubes.
5. A liquid scintillation system according to claim 4 having adjustment means for adjusting the amplification gain at each of said predetermined dynodes.
6. A symmetrical spectrometer system for measuring the energy of beta decay events of n different radioisotopes having different energy spectra and contained in liquid samples, comprising at least two detectors responsive to beta decay events occuring in a sample for producing electrical pulses whose amplitude is in direct relation with the energy of the originating beton decay event, means for summing said electrical pulse signals from said detectors, a coincident circuit providing an output on occurence of pulses from all said detectors during a predetermined time delay, means for amplifying the signal from said detectors, comprising a plurality of linear amplification stages in series aiding relation each providing a predetermined adjustable amplification gain, and at least n counting channels each having ; counting means, a pulse heigh analyzer for delivering a pulse responsive to each input pulse falling in a preselected amplitude band to said counting means, gating means operative when energized by said coincidence circuits, and operator controlled selector means for connecting the input of said pulse height analyzer to the output of any one of said amplification stage.
7. A spectrometer system according to claim 6 wherein the amplifier means provide extreme amplification gains which are in a 100/1 ratio.
8. A spectrometer system according to claim 6, wherein the amplifier means comprise two stages each providing a gain of 10.
9. A spectrometer system according to claim 6, wherein the amplifier means comprise successive stages providing gains of 3 and 3 1/3 in alternance.
10. A liquid scintillation counting system for sorting n different isotopes having different Beta decay energy spectra and contained in liquid samples which also contain scintillator means which convert the energies of said Beta particles into light energy pulses comprising : at least one photomultiplier tube responsive to said light energy pulses for producing electrical pulses each of said photomultiplier tubes having: a plurality of dynodes, means for adjusting the amplification gain between a plurality of successive dynodes; at least n counting channels each having : counting means, pulse height discriminator means for passing only a preselected amplitude band of pulses to said counting means, and an operator controlled selector switch for connecting the input of said pulse height analyzer to one selected of said plurality of dynodes.
11. A liquid scintillation counting system according to claim 10, having at least two identical photomultiplier tubes, a coincidence circuit operatively associated with the anodes of said photomultiplier tubes, means for adjusting the gains at corresponding dynodes of the said phototubes to the same value, summation means for summing the pulses from at least a pair of corresponding dynodes of said photomultiplier tUbes which correspond to the higher amplification gains, said selector switches being constructed for connecting the inputs of said pulse height analyzers either to said pair of dynodes across said summation means or direct to another dynode of one phototube providing a gain lower than that of said pair of dynodes.
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