Some rules to improve the energy resolution in alpha liquid scintillation with beta rejection
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J. Aupiais
Abstract
Two common scintillating mixtures dedicated to alpha measurements by means of alpha liquid scintillation with pulse shape discrimination were tested: the di-isopropylnaphthalene — based and the toluene-based solvents containing the commercial cocktails Ultima Gold AB® and Alphaex®. We show the possibility to enhance the resolution up to 200% by using no-water miscible cocktails and by reducing the optical path. Under these conditions, the resolution of about 200 keV can be obtained either by the Tri CarbTM or by the PeralsTM spectrometers. The time responses, e.g., the time required for a complete energy transfer between the initial interaction alpha particle-solvent and the final fluorescence of the organic scintillator, have been compared. Both cocktails present similar behavior. According to the Förster theory, about 6-10 ns are required to complete the energy transfer. For both apparatus, the detection limits were determined for α emitters. The sensitivity of the Tri Carb was improved by 300% but remains 40% lower than that of Perals, due to a higher α/β discrimination and the use of vials with lower optical path.
© 2003 Oldenbourg Wissenschaftsverlag GmbH
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Articles in the same Issue
- Some rules to improve the energy resolution in alpha liquid scintillation with beta rejection
- Confidence intervals for experiments with background and small numbers of events
- Solubility product of Pu(VI) hydrous oxide
- Precipitation of crystalline neptunium dioxide from near-neutral aqueous solution
- Stability of U(VI) solid phases in the U(VI)-Ca2+-SiO2-OH system
- Synergistic extraction of Th(IV) by 2-hydroxy-1-naphthaldehyde thiosemicarbazone and neutral donors
- Production of 55Co via the 54Fe(d,n)-process and excitation functions of 54Fe(d,t)53Fe and 54Fe(d,α)52mMn reactions from threshold up to 13.8 MeV
- Potential in vivo generator for alpha-particle therapy with 212Bi: Presentation of a system to minimize escape of daughter nuclide after decay of 212Pb to 212Bi
- In vitro study of the interaction between neptunium ions and aposerumtransferrin by absorption spectrophotometry and ultrafiltration: the case of Np(V)
