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This work presents measurements of the half-lives of excited nuclear states of 237Np and 57Fe using a liquid scintillation spectrometer and a gamma detector. A novel approach for the determination of the half-lives of some excited states is presented which uses only LS counting data from a detector with two PMTs. Read more
This work explores the distribution of time intervals between signals from the photomultiplier tubes (PMTs) of a liquid scintillation counting (LSC) system when a scintillation burst caused by an ionizing particle is detected. This distribution is termed the cross-correlation distribution and it is shown that it contains information about the probability to detect a scintillation event. A theoretical model that describes the cross-correlation distribution is derived. The model can be used to estimate the mean number of detected photons in a LSC measurement, which allows the calculation of the detection efficiency. The theoretical findings are validated by Monte Carlo simulations and by experiments with dedicated LSC systems and several commercial LSC cocktails. The results show that some of the parameters of the cross-correlation distribution such as the peak height or the kurtosis can be used as detection efficiency estimators or quenching indicators in LSC. Thus, although the time domain and the cross-correlation distribution have received little to no attention in the practice of LSC, they have the capacity to bring significant improvements in almost all LSC applications related to activity determination. The results also suggest concepts for Read more
This paper presents studies of the influence of the coincidence resolving time on the activity calculated by the Triple-to-Double Coincidences Ratio (TDCR) method in Liquid Scintillation (LS) counting. Recently, published methods for the correction for accidental coincidences in TDCR counting open the possibility to use resolving times up to several microseconds, long enough not to miss true coincidences and to study the effects of delayed fluorescence. Read more
This paper presents analytical and experimental methods to evaluate the accidental coincidence counting rates in a Triple-to-Double Coincidence Ratio (TDCR) Liquid Scintillation (LS) measurement. Read more
This work presents a comparison of two different logics for imposing extending-type dead-time in TDCR measurements: the common dead-time (CDT) and the individual dead-time (IDT) counting logics. Read more
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Recommended citation: Krasimir Mitev, Chavdar Dutsov, Ludmil Tsankov, Strahil Georgiev, Mityo Mitev, Nikolay Markov, Todor Todorov, "Design and Field Tests of Scintillation Spectrometer for Continuous Radon in Soil-gas Monitoring." In the proceedings of 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC), 2018.
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