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The present work describes the new software methodology under development at the IPEN Nuclear Metrology Laboratory for radionuclide standardizations with coincidence technique. The software includes the Coincidence Graphic User Interface (GUI) and the Coincidence Analysis Program. The first results for a 60 Co sample measurement are discussed...
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Citations
... When real-time operation is not required, alternative approaches based on the analysis of recorded pulse information can be used (e.g. Havelka et al., 2002;Brancaccio et al., 2009). These systems are based on the registration of pulse properties (e.g. ...
Conventional real-time coincidence systems use electronic circuitry to detect
coincident pulses (hardware coincidence). In this work, a new concept of
coincidence system based on real-time software (software coincidence) is
presented. This system is based on the recurrent supervision of the
analogue-to-digital converters status, which is described in detail. A
prototype has been designed and built using a low-cost development platform.
It has been applied to two different experimental sets for cosmic ray muon
detection. Experimental muon measurements recorded simultaneously using
conventional hardware coincidence and our software coincidence system have
been compared, yielding identical results. These measurements have also been
validated using simultaneous neutron monitor observations. This new software
coincidence system provides remarkable advantages such as higher simplicity
of interconnection and adjusting. Thus, our system replaces, at least, three
Nuclear Instrument Modules (NIMs) required by conventional coincidence
systems, reducing its cost by a factor of 40 and eliminating pulse delay
adjustments.
... The hardware performs the disk files recording of the amplitudes and occurrence instants of all the detected beta and gamma pulses from the nuclear 4-γ detection arrangement. In a second step, the saved data files are processed by the coincidence analysis program, under development at LMN [11], in order to obtain the beta, gamma and coincidence counts, and then, calculate the activity of the target radionuclide. This software process includes compensation corrections for the background radiation (BG), for the radioactive decay and for the system dead times. ...
The Laboratório de Metrologia Nuclear – LMN, Nuclear Metrology Laboratory –, at IPEN-CNEN/SP, São Paulo, Brazil, developed a new Software Coincidence System (SCS) for 4-γ radioisotope standardization. SCS is composed by the data acquisition hardware, for the coincidence data recording, and the coincidence data analysis program that performs the radioactive activity calculation for the target sample. Due to hardware intrinsic signal sampling characteristics, multiple undesired data recording occurs from a single saturated pulse. Also pulse pileup leads to bad data recording. As the beta counting rates are much greater than the gamma ones, due to the high 4 geometry beta detecting efficiencies, the beta counting significantly increases because of multiple pulse recordings, resulting in a respective increasing in the calculated activity value. In order to minimize such bad recordings effect, a software dead time value was introduced in the coincidence analysis program, under development at LMN, discarding multiple recordings, due to pulse pileup or saturation. This work presents the methodology developed to determine the optimal software dead time data value, for better accuracy results attaining, and discusses the results, pointing to software improvement possibilities.
The procedure for determining the (67)Ga disintegration rate by a primary method is described. The proposed triple 4πβ-γ coincidence system consists of a thin window gas-flow 4π proportional counter (PC) coupled to a NaI(Tl) scintillator and a HPGe crystal. Independent pulse height and occurrence time information is provided for the three detector outputs by means of a Software Coincidence System. Separate spectrometry measurements with a n-type reversed electrode coaxial Ge detector (REGe) were performed for obtaining gamma-ray emission probabilities per decay. Accurate values of disintegration rate, gamma-ray emission probabilities and the metastable half-life were achieved.
