A new time interval analysis system for the on-line monitoring of artificial radionuclides in airborne dust using a phosfitch type alpha/beta detector

Three statistical control chart methods were investigated to determine the one with the highest detection probability and the best average run length (ARL). The three control charts include the Shewhart control chart of count data, cumulative sum (CUSUM) analysis of count data (Poisson CUSUM), and CUSUM analysis of time-interval (time difference between two consecutive radiation pulses) data (time-interval CUSUM). The time-interval CUSUM (CUSUMti) control chart was compared with the Poisson CUSUM (CUSUMcnt) and the Shewhart control charts with experimental and simulated data. The experimental data were acquired with a DGF-4C (XIA, Inc.) system in list mode. Simulated data were obtained by using Monte Carlo techniques to obtain a random sampling of a Poisson process. All statistical algorithms were developed using R (R Development Core Team). Detection probabilities and ARLs for the three methods were compared. The time-interval CUSUM control chart resulted in a similar detection probability as that of the Poisson CUSUM control chart but had the shortest ARL at relatively higher radiation levels; e.g., about 40% shorter than the Poisson CUSUM at 10.0 counts per second (cps) (five times above the background count rate). Both CUSUM control charts resulted in a higher detection probability than that of the Shewhart control chart; e.g., 100% greater than the Shewhart control method at 4.0 cps (two times above the background count rate). In addition, when time-interval information was used, the CUSUM control chart coupled with a modified runs rule (mrCUSUMti) showed the ability to further reduce the time needed to respond to changes in radiation levels and keep the false positive rate at a required level.

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Theoretical Approaches to Multiple Pulse Time Interval Analysis (MTA) and Its Practical Utilization for Determination of Radioactive Nuclides Separated into Decay Series

崇¹,

哲夫²

2007

RADIOISOTOPES

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A new time interval analysis system for the on-line monitoring of artificial radionuclides in airborne dust using a phosfitch type alpha/beta detector

Cited by 5 publications

References 6 publications

Enhancing artificial radionuclides monitoring: a Bayesian statistical approach combined with the multi time-interval analysis method

Enhancing artificial radionuclides monitoring: a Bayesian statistical approach combined with the multi time-interval analysis method

CUSUM Analyses of Time-Interval Data for Online Radiation Monitoring

Theoretical Approaches to Multiple Pulse Time Interval Analysis (MTA) and Its Practical Utilization for Determination of Radioactive Nuclides Separated into Decay Series

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