NIST measurement services :

Hutchinson, J.M.R.

doi:10.6028/nist.sp.250-5a

Cited by 1 publication

(2 citation statements)

References 8 publications

(16 reference statements)

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“…The detector, electronics, and basic analysis method have been described by Hutchinson and Bright (1987) and Hutchinson (2004). In short, the 2 π multi-wire proportional counter was run with flowing P-10 gas (standard 90 % argon / 10 % methane mixture by volume), at a nominal pressure of 0.1 MPa.…”

Section: Equipment and Methodsmentioning

confidence: 99%

“…Spectra were corrected for background before performing further analysis. First the typical integral-spectrum-counting analysis method was performed (Hutchinson 2004), which involves placing a low-energy cut on the spectrum above the detector noise floor and then extrapolating the low-energy tailing of the alpha peak to channel zero using a linear function of slope 0 (horizontal) or else one that slopes down to the origin. In this work, a horizontal extrapolation was used, with the count level set by averaging over about 20 channels in the region of local count minimum below the alpha shoulder (See Figure 1).…”

Section: Equipment and Methodsmentioning

confidence: 99%

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Large area alpha sources with a lip: Integral counting and spectral distortions

King

Fitzgerald

Tosh

2018

Applied Radiation and Isotopes

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The detection efficiency for large area alpha sources with adjustable heights of a raised lip around the edge were measured by 2π gas-filled proportional counter. The variations in low-energy spectral shape were modeled using a Geant4 radiation and charge transport Monte Carlo simulation, to enable extrapolation of the spectrum to zero energy. COMSOL Multiphysics finite-element analysis was used to explore changes in the spectrum gain in the presence of a lip. It qualitatively reproduced an increase in peak height due to an increasing height of the source lip. A spectrum analysis procedure was developed to perform integral counting on sources with a lip. The experimental results were used to validate the model, which was then used to predict the changes in 2π counting efficiency for other source-lip geometries.

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Section: Equipment and Methodsmentioning

confidence: 99%

Section: Equipment and Methodsmentioning

confidence: 99%