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US 5,210,419 AGranted
Method for liquid scintillation counting of radioactive nuclides
OwnerFerdinand Buheitelinventor
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OwnerFerdinand Buheitelinventor
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"A method for liquid scintillation counting of the radioactive nuclides of the natural decay chains of Th-232, U-238 and U-235 by detecting decay events of the short-lived members Po-212, Po-214 and Po-215 of these decay chains by the principle of delayed coincidence, characterized in that a separate pulse height spectrum is recorded for those pulses of the counting device which occur within a fixed short time interval after a preceding pulse. The successive decays cause pairs of quickly succeeding pulses to be detected; the coincidence of these pulses within a brief time interval makes it possible to distinguish the decay events from other decay events. The invention further permits simultaneous counting of different isotopes by fixing several short time intervals following a first pulse, and assigning a second pulse following the first pulse to one of several separate pulse height spectra in accordance with the length of the time interval within which the second pulse occurs."
A method for liquid scintillation counting of radioactive nuclides of the natural decay chains of Th-232, U-238 and U-235 by detecting decay events of the short-lived members Po-212, Po-214 and Po-215 of these decay chains by the principle of delayed coincidence, characterized in that a plurality of pulse height spectra are recorded from the delayed coincidence pulses which occur within a plurality of successive fixed time intervals after a gate-opening pulse, and in that each said delayed coincidence pulse counted is assigned to a corresponding one of said plurality of pulse height spectra based on the time interval in which the delayed coincidence pulse occurred.
A method for liquid scintillation counting of radioactive nuclides of the natural decay chain of U-238 by detecting decay events of the short-lived member Po-214 of this decay chain by the principle of delayed coincidence, characterized in that a separate pulse height spectrum is recorded from the delayed coincidence pulses which occur within a fixed time interval after a gate-opening pulse, whereby the activity of Rn-222 or Ra-226 is calculated from the content of an alpha peak of Po-214 in the separate pulse height spectrum.
A method for liquid scintillation counting of radioactive nuclides of the natural decay chain of Th-232 by detecting decay events of the short-lived member Po-212 of this decay chain by the principle of delayed coincidence, characterized in that a separate pulse height spectrum is recorded from the delayed coincidence pulses which occur within a fixed time interval after a gate-opening pulse, whereby the activity of Ra-224 or Ra-228 is calculated from the content of an alpha peak of Po-212 in the separate pulse height spectrum.
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