A new 4π(LS)-γ coincidence counter at NCBJ RC POLATOM with TDCR detector in the beta channel

Ziemek, Tomasz; Jęczmieniowski, A.; Cacko, Daniel; Broda, R.; Lech, Edyta

doi:10.1016/j.apradiso.2015.12.017

Cited by 17 publications

(2 citation statements)

References 10 publications

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“…A set of six sources containing from 135.7 mg to 138.6 mg of radioactive solution mixed with the Ultima Gold liquid scintillator was prepared. Sources were measured in the TDCR [3] and a new TDCRG counter equipped with a digital board with FPGA [11] Counting rates were registered and background rate was subtracted. A set of 8 counting points at various counting efficiencies was obtained by reducing the PMTs focusing potential.…”

Section: Fig 1 Simplified Scheme Of the Tdcr Counter A B Cphotomultip...mentioning

confidence: 99%

Realisation of Radionuclides Activity Unit Using the Liquid Scintillation Counting (Lsc)

Broda

Dziel

Ziemek

et al. 2016

IAPGOS

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Registration of the effects of interaction of the radiation emitted after radioactive decay enables determination of activity of a given material expressed in becquerels (Bq). Measurements in a frame of international comparisons of 14 C activity using the triple-to-double coincidence ratio (TDCR) method and of 177 Lu activity using the 4(LS)- coincidence and anticoincidence method, where the liquid scintillation technique (LSC) was used, were described. Specificity of short-lived radionuclides activity determination was discussed.

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Section: Fig 1 Simplified Scheme Of the Tdcr Counter A B Cphotomultip...mentioning

confidence: 99%

Realisation of Radionuclides Activity Unit Using the Liquid Scintillation Counting (Lsc)

Broda

Dziel

Ziemek

et al. 2016

IAPGOS

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“…Recently, the triple to double coincidence ratio (TDCR) method based on a three PM detection system for liquid scintillation counting [3][4][5] has been extended to 4π(LS)β-γ coincidence counting [6][7][8]. Since the thermal noise and the after-pulses detected in each PM tube are in uncorrelated relation each other, thus expected to remove them from the coincidence channel.…”

Section: Introductionmentioning

confidence: 99%

An Improved Movable 3 photomultiplier (3PM)-γ Coincidence Counter Using Logical Sum of Double Coincidences in β-Channel for Activity Standardization

Hwang

Lee

2020

J Radiat Prot Res

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Background: To improve the measurement accuracy of liquid-scintillation counting for activity standardization, it is necessary to significantly reduce the background caused by thermal noise or after-pulses. We have therefore improved a movable 3 photomultiplier (3PM)-γ coincidencecounting method using the logical sum of three double coincidences for β events. Materials and Methods: We designed a new data-acquisition system in which β events are obtained by counting the logical sum of three double coincidences. The change in β-detection efficiency can be derived by moving three photomultiplier tubes sequentially from the liquid-scintillation vial. The validity of the method was investigated by activity measurement of 134 Cs calibrated at the Korea Research Institute of Standards and Science (KRISS) with 4π(PC)β-γ(NaI(Tl)) coincidence counting using a proportional counter (PC) for the β detector. Results and Discussion: Measurements were taken over 14 counting intervals for each liquidscintillation sample by displacing three photomultiplier tubes up to 45 mm from the sample. The dead time in each βand γ-counting channel was adjusted to be a non-extending type of 20 μs. The background ranged about 1.2-3.3 s-1 , such that the contributions of thermal noise or afterpulses were negligible. As the β-detection unit was moved away from the sample, the β-detection efficiencies varied between 0.54 and 0.81. The result obtained by the method at the reference date was 396.3 ± 1.7 kBq/g. This is consistent with the KRISS-certified value of 396.0 ± 2.0 kBq/g within the uncertainty range. Conclusion: The movable 3PM-γ method developed in the present work not only succeeded in reducing background counts to negligible levels but enabled β-detection efficiency to be varied by a geometrical method to apply the efficiency extrapolation method. Compared with our earlier work shown in the study of Hwang et al. [2], the measurement accuracy has much improved. Consequently, the method developed in this study is an improved method suitable for activity standardization of β-γ emitters.

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Bilateral comparison of 14C activity measurements at the NCBJ RC POLATOM and the ENEA-INMRI

Ziemek

Capogni

Broda

et al. 2017

J Radioanal Nucl Chem

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A new 4π(LS)-γ coincidence counter at NCBJ RC POLATOM with TDCR detector in the beta channel

Cited by 17 publications

References 10 publications

Realisation of Radionuclides Activity Unit Using the Liquid Scintillation Counting (Lsc)

Realisation of Radionuclides Activity Unit Using the Liquid Scintillation Counting (Lsc)

An Improved Movable 3 photomultiplier (3PM)-γ Coincidence Counter Using Logical Sum of Double Coincidences in β-Channel for Activity Standardization

Bilateral comparison of 14C activity measurements at the NCBJ RC POLATOM and the ENEA-INMRI

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