Zobrazeno 1 - 10
of 30
pro vyhledávání: '"M.L. Aceña"'
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 334:477-484
The alpha-particle emission probabilities (Pα) of 239Pu have been measured using material of highest enrichment and radiochemical purity, thin sources produced by vacuum sublimation, and high-resolution α spectroscopy with ion-implanted Si detector
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 312:317-322
α-particle emission probabilities (Pα) in the decay of 243Am have been measured using ion-implanted silicon detectors. Measurements and spectrum analyses were carried out at CIEMAT and CBNM. Values for the Pα of nine branches are reported, with un
Publikováno v:
International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes. 43:247-252
The alpha-particle-emission probabilities (Pα) of 236Pu have been measured using thin sources produced by sublimation in vacuum, and a passivated implanted planar silicon (PIPS) detector of 50-mm2 active area. Two different peak-fitting models were
Autor:
P. Burger, R.A.P. Wiltshire, G. Bortels, A.J. Fudge, M.L. Aceña, D. Mouchel, Eduardo García-Toraño, M. King, R. Eykens
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 295:199-206
Measurements of the alpha-particle emission probabilities (Pα) of 237Np have been done on two high-purity source materials of different origin, using a passivated implanted planar silicon detector. Two peak-fitting models were used to analyse the sp
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 286:429-432
A series of well-characterized doublets has been constructed from 234 U alpha-particle spectra to compare fitted peak-area ratios and positions with the known values. Results obtained using fitting models at CBNM and CIEMAT are discussed.
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 286:384-387
Monte Carlo simulation has been developed to model the slowing down and scattering of alpha particles in amorphous media so that corrections for backscattered and absorbed particles can be determined for 2π geometry measurements. These calculations
Publikováno v:
Journal of Alloys and Compounds. :557-559
Accurate and reliable analytical methods have been developed for the measurement of Pu, Am and Cm in typical waste streams from nuclear power plants. Pu, Am and Cm were separated using anion exchange and coprecipitation techniques. The solution of Am
Publikováno v:
International journal of radiation applications and instrumentation. Part A, Applied radiation and isotopes. 43(1-2)
In this paper the problems associated with the "in situ" concentration techniques using MnO2 and Al2O3 as adsorbents are reviewed. Sampling equipments, radiochemical separation procedures, yield tracers, sources preparation and counting methods are d
Autor:
E. Garcia-Toraño, M.L. Aceña
Publikováno v:
Nuclear Instruments and Methods in Physics Research. 185:261-269
An equation has been deduced which appropriately represents the form of an experimental alpha peak obtained with Si surface barrier detectors. On this basis a nonlinear alpha spectra analysis method is proposed. The results are checked by applying th
Autor:
M.L. Aceña, M.T. Crespo
Publikováno v:
International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes. 39:177-178
When the isotopic composition of the radium contained in a sample is obtained by measuring at different times the alpha-activity of the Ra fraction obtained by coprecipitation with Ba, the contribution of the daughters of the lead coprecipitated with