Determination of the Combined Collection-Counting Efficiency of Radon Progeny on Wire Screens

2021 ◽  
pp. 217-245
Author(s):  
C.R. Phillips ◽  
L. Morawska ◽  
A. Khan ◽  
I.-C. Hsieh
Keyword(s):  
Counting Efficiency ◽  
Radon Progeny

WDC: Advanced System for Characterization of Alpha-Bearing Waste Contained in 200L and 400L Drums: Performances and Lessons Learned From the First Industrial Measurement Campaigns

2007 ◽  
Author(s):  
A. Libens ◽  
M. Vandorpe ◽  
J. M. Cuchet
Keyword(s):  
Limit Of Detection ◽  
Counting Efficiency ◽  
Lessons Learned ◽  
Nuclear Facilities ◽  
Nuclear Operators ◽  
System A ◽  
The Future ◽  
Coincidence Counter ◽  
Short Time

The Waste Drum Characterization installation was originally developed for the assay of alpha-bearing waste in standard 200 l (55 gallons) drums during the dismantling operations of the Siemens mixed-oxide (MOX) facility in Hanau (Germany). That installation was validated and qualified by the German authorities, its main performances being: - Counting efficiency for coincident neutrons: app. 1%; - Lowest Limit of Detection (LLD): 75 mg 240Pueq; - Pu content per drum: up to 100 g tot. (35 g 240Pueq); - Measurement duration: app. 20 minutes. The success of this system, a passive neutron coincidence counter combined with a high resolution gamma spectrometer, led to the radiological characterization and qualification of about 1,700 drums during the period 2001 – 2004. In 2005, after completion of the dismantling operations of the Siemens MOX facility, Tecnubel took over the WDC installation which could be used in the frame of the future dismantling of the Belgonucleaire’s MOX plant in Dessel (Belgium), which can be comparable to the Siemen’s one. This second (and new) life for the WDC means that it must be rigorously retested and validated against the Belgian authorities requirements. Furthermore, and additionally to the future use in the Belgonucleaire’s facility, Tecnubel was faced with new challenges, namely: - Assay of 400 l drums together with the 200 l packages; - Determination of the real LLD taking into account the background in different Belgian nuclear facilities, the determination of a value of ∼5 mg 240Pueq being an objective; - Assay of mixed alpha/beta-gamma wastes; - Transportability of the WDC from one plant to another; - Assistance to different nuclear operators for the licensing of the WDC for their own waste types. This paper describes the installation itself and its performances, presents the difficulties encountered during the new challenge and the results of the performed revalidation tests; it gives the perspectives and objectives on short time as well.

MEASUREMENT OF THE POTENTIAL ALPHA ENERGY CONCENTRATION OF RADON PROGENY BY USING LIQUID SCINTILLATION COUNTING METHOD

2019 ◽  
Vol 184 (3-4) ◽  
pp. 440-443 ◽  
Author(s):  
Bin Feng ◽  
Quan Tang ◽  
Hui Zhang ◽  
Bo Chen ◽  
Shoukang Qiu ◽  
...  
Keyword(s):  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Scintillation Counter ◽  
Counting Efficiency ◽  
Scintillation Counting ◽  
Energy Concentration ◽  
Radon Progeny ◽  
Counting Method ◽  
Quenching Effect ◽  
Standard Source

Abstract For more accurate measurement of the potential alpha energy concentration (PAEC) of radon progeny by the liquid scintillation counting (LSC) method, its counting efficiency was studied in this work. A radon progeny standard source was used to provide different concentrations of radon progeny, and the progeny collected on the sampling filters were measured with a low background liquid scintillation counter. The result showed that the quenching effect could not be ignored, and the counting efficiency was estimated to be 86.12%. The co-comparison experiments showed that the PAECs of radon progeny measured by the LSC methods were in generally consistent with those of other three methods. It indicates that for more accurate measurements of PAEC of radon progeny by using the LSC method, the counting efficiency should be well determined.

Determination of Neptunium-239 Counting Efficiency

1957 ◽  
Vol 29 (7) ◽  
pp. 1048-1050 ◽  
Author(s):  
W. S. Lyon
Keyword(s):  
Counting Efficiency

scholarly journals Balanced-Energy Counting Window for Stable Liquid Scintillation Radiocarbon Dating

Radiocarbon ◽  
2011 ◽  
Vol 53 (2) ◽  
pp. 297-302 ◽  
Author(s):  
Pall Theodórsson
Keyword(s):  
High Precision ◽  
Liquid Scintillation ◽  
Counting Efficiency ◽  
Energy Calibration ◽  
Logarithmic Amplifier ◽  
Before And After ◽  
Linear Amplifier ◽  
The Stability ◽  
Counting Window

This paper describes an optimal radiocarbon counting window for liquid scintillation (LS) 14C dating that secures for unquenched as well as for heavily quenched dating samples maximal stability of 14C counting efficiency and theoretically minimal quench correction. In high-precision dating, a balanced counting window with fixed channel limits is frequently used, where about 3% of the highest part of the 14C spectrum is sacrificed for high 14C counting stability. The stability is, however, diminished for quenched samples. Therefore, this window is here replaced by a balanced fixed-energy 14C counting window where the channel limits depend on the quench level. The LS system used must have a linear amplifier and a multichannel analyzer. All samples are measured at a fixed high voltage. For energy calibration and determination of the quench level, the channel number of the middle of the 59.5-keV peak from an external 241Am gamma source is determined before and after measuring each sample. This counting mode is valuable in high-precision dating. It could be widely applied if adapted to systems with a logarithmic amplifier, generally used in LS dating.

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