Simultaneous determination of environmental α-radionuclides using liquid scintillation counting combined with time interval analysis (TIA) and pulse shape discrimination (PSD)

Hashimoto, Takeji; Sato, Kaneaki; Yoneyama, Y.; Fukuyama, Natsumi

doi:10.1007/bf02034256

Cited by 11 publications

(10 citation statements)

References 5 publications

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“…The measuring system consists of an α-LSC (Ordera 8100AB) called Perals, a multi-channel analyzer (MCA, Seiko EG&G, 7800), and a personal computer (Epson PC-486 SE) with a timer/counter module (Contec, TIR-6) having a time resolution of 0.1 ms. Details of the assembly have been presented in elsewhere [3,4,5]. The Perals spectrometer contains a pulse shape discrimination (PSD) circuit to reject pulses caused by β-particles and γ-rays and to extract pure α-pulses.…”

Section: Measurement Systemmentioning

confidence: 99%

“…9(b), the number of correlated total events is obtained from the initial exponential decay curve over the noise (horizontal line), which is due to random events. The exponential decay component was extracted from the data for the correlated events or for analysis of the radionuclide after correction with the overall yield from the 225 Ra-tracer [1,2,3,4,5,6]. It should be emphasized that the use of a 225 Ra-tracer is helpful in determining the other radium isotopes.…”

Section: Effects Of Purging the Scintillator Cocktail With Nitrogen Gasmentioning

confidence: 99%

“…In addition to 222 Rn→ 216 Po (T 1/2 145 ms) (Th-series) the TIA-MTA method has been applied to the determination of two other correlated α-α decay events, including 219 Rn→ 215 Po (T 1/2 1.78 ms) (Ac-series) and 221 Fr→ 217 At (T 1/2 32.3 ms) (Np-series) [3,4,5,6]. The members of the Np-series are well known to consist of artificial decay series, so 225 Ra in this series could be used as a yield tracer for natural radium isotopes by the TIA method with the growth relationship of transient equilibrium [5].…”

Section: Introductionmentioning

confidence: 99%

“…The members of the Np-series are well known to consist of artificial decay series, so 225 Ra in this series could be used as a yield tracer for natural radium isotopes by the TIA method with the growth relationship of transient equilibrium [5].…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous determination of radionuclides separable into natural decay series by use of time-interval analysis

Hashimoto

Sanada²,

Uezu³

2004

Analytical and Bioanalytical Chemistry

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A delayed coincidence method, time-interval analysis (TIA), has been applied to successive alpha- alpha decay events on the millisecond time-scale. Such decay events are part of the (220)Rn-->(216)Po ( T(1/2) 145 ms) (Th-series) and (219)Rn-->(215)Po ( T(1/2) 1.78 ms) (Ac-series). By using TIA in addition to measurement of (226)Ra (U-series) from alpha-spectrometry by liquid scintillation counting (LSC), two natural decay series could be identified and separated. The TIA detection efficiency was improved by using the pulse-shape discrimination technique (PSD) to reject beta-pulses, by solvent extraction of Ra combined with simple chemical separation, and by purging the scintillation solution with dry N(2) gas. The U- and Th-series together with the Ac-series were determined, respectively, from alpha spectra and TIA carried out immediately after Ra-extraction. Using the (221)Fr-->(217)At ( T(1/2) 32.3 ms) decay process as a tracer, overall yields were estimated from application of TIA to the (225)Ra (Np-decay series) at the time of maximum growth. The present method has proven useful for simultaneous determination of three radioactive decay series in environmental samples.

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Section: Measurement Systemmentioning

confidence: 99%

Section: Effects Of Purging the Scintillator Cocktail With Nitrogen Gasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simultaneous determination of radionuclides separable into natural decay series by use of time-interval analysis

Hashimoto

Sanada²,

Uezu³

2004

Analytical and Bioanalytical Chemistry

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“…6 The PERALS spectrometer contains a pulse shape discrimination (PSD) circuit combined with optically excellent efficiency containing a single photomultiplier tube and reflector surface. After optimizing the pulse shape discrimination level, the spectrometer provides either analog output signal of both a-and ~/y-particles or a-particle alone, dependent on the different pulse shapes of a-and [3/y-radiations.…”

Section: Alpha-spectrometry With Liquid Scintillation and Tiaanalysismentioning

confidence: 99%

Pulse time interval analysis (TIA) combined with liquid scintillation counting for the determination of environmental α-nuclides: Preparation and utilization of225Ra as a yield tracer

Hashimoto

Yoneyama

Sato

et al. 1999

J Radioanal Nucl Chem

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Time interval analysis (T1A), which has been verified to be suitable for the selective extraction of correlated successive c~-decay events within a liquid scintillator, was further developed by combining pulse shape discrimination technique and simple chemical analysis. A [3-emitter nuclide, 225Ra, which is suitable for the use as a yield tracer belonging to Np-decay series, was also found to be detectable by the TIA-method after a certain standing period when the radium-extractant (RADAEX) was added small amounts of HDEHP [di (2-ethylhexyl) phosphoric acid], which was proved to keep the equilibrium state between Ra and its descendants. The present counting system (TIA analysis incorporated r has been verified to be applicable to the simultaneous determination of three (including Th, Ac, and Np) decay series, if the chemical purification of radium fraction was applied to the environmental samples using an extractive scintillator in addition to utilization of an a-peak itself at lowest energy for the determination of 226Ra in uranium decay series. This radioanalytical method was practically applied to the determination of natural radionuclides belonging to three decay series in environmental samples and compared to the alpha-spectrometric results using a Si-surface barrier detector (SSB).

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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

Sakaue¹,

Fujimaki²,

Tonouchi³

et al. 2007

J Radioanal Nucl Chem

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Simultaneous determination of environmental α-radionuclides using liquid scintillation counting combined with time interval analysis (TIA) and pulse shape discrimination (PSD)

Cited by 11 publications

References 5 publications

Simultaneous determination of radionuclides separable into natural decay series by use of time-interval analysis

Simultaneous determination of radionuclides separable into natural decay series by use of time-interval analysis

Pulse time interval analysis (TIA) combined with liquid scintillation counting for the determination of environmental α-nuclides: Preparation and utilization of225Ra as a yield tracer

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

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