Application for nuclear sample mesurements
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Beta and Beta/Gamma spectrometry systems for sample measurements.
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As central E-detectors for spectrometry plastic scintillators but also NaI & HPGe detectors can be used, both for simultaneous gamma spectrometry also.
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In combination with a high beta-sensitive thin plastic scintillator or gas detector used as dE-detector for very high beta separation.
For National and international organizations and companies in
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Environmental, health and food surveillance and laboratories
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Universities, research centers, nuclear medicine
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Industry- and nuclear technology
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Dismantling, consulting, waste management
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Civil defense, emergency response, border, safety, security and access control
Beta Spectrometry Systems
Important Highlights:
Selectivity
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Using one of the ISuS dE-detectors where beta particles can be separated perfectly from photons.
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Separation factors of more than 1000 are realizable
Efficiency
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Related to a 2π-source emission geometry using a Sr/Y-90 source in equilibrium up to 50 % efficiency.
Lower Limit of Detection (LLD)
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Depends on the selected detection system, the source geometry & sample preparation and the nuclide matrix in the sample. LLD's down to 3 mBq/g sample weight are attainable.
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Example for dE Detectors:
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Gas flow -detector (standard: Methane, or other Gas)
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Geometry: about 16 mm thick, ~ 70 or 120 mm sensitive inner diameter, Outer diameter: 98 as well as 160 mm
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Type: Transmission-Detector
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Beta-sensitivity: down to about 50 keV
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Beta/Gamma Separation Power: about 1000
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Very thin plastic scintillator detector (< 1 mm) with large surface
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Substantial Advantages
Using point sources, filter samples or thin Petrie-shells with as lower self-absorption as possible
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no chemical sample preparation is necessary
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the filters sample can be used close on a detector endcap,
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for liquids sources mostly an evaporation is sufficient
Beta and/or photon spectra can be detemined depedent from the system configuration.
Pure Beta-Spectra
The linear spectra show the perfect beta distributions of 3 Sr/Y-90 filter samples (down to 10 mBq) measured with a plastic scintillation detector system. The low energy Sr-90 and the high energy Y-90 distribution is shown in the spectra and can be separated.
above:
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128 mBq (pink)
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50 mBq (magenta)
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10 mBq (red)
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background (black)
and down:
with background subtraction
​Sr/Y-90 source measured with a HPGe decetor without lead shield (black) and in beta-coincidence with a gas detector direct in front of the HPGe endcap (red). It shows the pure beta-distribution (red) through the perfect beta selection of the gas detector in log-mode.
TIME IS MONEY!
Determine the lowest level Beta/Gamma-Activities with minimum of sample preparation “simultaneously” by Beta- and Photon-Spectrometry
