ABSTRACT Gamma-ray spectra from the radioactive decay of **1**4**0Ba and **1**4**0La were observe... more ABSTRACT Gamma-ray spectra from the radioactive decay of **1**4**0Ba and **1**4**0La were observed by Ge(Li) spectroscopy. Gamma-ray energies were found to be consistent with literature values, but several of the observed gamma rays were found to have intensities differing significantly from those previously reported. Absolute intensities of prominent gamma rays emitted in the radioactive decay of **1**4**0Ba and **1**4**0La have been measured. The 12. 8-day **1**4**0Ba activity was produced by 14. 8-MeV neutron fission of **2**3**8U followed by radiochemical separation and purification.
The fission yields of 38 mass chains are measured using radiochemical method as well as direct Ge... more The fission yields of 38 mass chains are measured using radiochemical method as well as direct Ge (Li) γ spectrometry. The fission yields are reported for the first time for mass chains 85, 87, 88, 101, 125, 128, 138, 153 and 161. The yields measured make up 114.4% of the total 200% expected from fiission. A fine structure exists at A = 134 and a small fine structure at A = 101-103. Under the light and heavy peak the total yields are both 100.1%. The peak widths taken at half maximum are 16.7 and 15.8 mass units, and the average mass numbers are 97.5 and 139.3 for the light and heavy peak respectively. The ratio of peak to valley is 179 (99Mo/115A).
Applications of High Intensity Proton Accelerators, 2010
This report has as an objective to assess the activation problem of the thorium target irradiatio... more This report has as an objective to assess the activation problem of the thorium target irradiation experiment at FNAL. The results presented are not activation calculation per se, but they provide guidelines to assess any possible impact on the beam stop surroundings due to the irradiation of the target with the low pulse rate 8 GeV proton beam. The average beam intensity is assumed to be 1.32 x10 11 protons per second and a full week of irradiation is assumed.
Industrial & Engineering Chemistry Research, 1999
A flowsheet for the extraction and immobilization of 99 TcO 4from radioactive wastes has been dev... more A flowsheet for the extraction and immobilization of 99 TcO 4from radioactive wastes has been developed. The three-stage flowsheet comprises selective sorption of 99 TcO 4by ABEC resins, secondary concentration of 99 TcO 4from H 2 O by a nonselective silica-based anion-exchange resin, and encapsulation and immobilization of the radionuclide-loaded anion-exchange resin in hydrous titanium oxide microspheres. Each process has been independently tested, and the results are discussed. The utility of this flowsheet in the extraction and immobilization of 99 TcO 4from alkaline radioactive wastes, neutralized nuclear fuel reprocessing streams, alkaline vitrification off-gas scrubber solutions, and solvent wash stages from the treatment of acidic high-level wastes is also presented.
The mass yield distribution of fission products produced in the photofission of 2~U using 9 MeV b... more The mass yield distribution of fission products produced in the photofission of 2~U using 9 MeV bremsstrahlung have been radiochemically measured for 21 mass chains. The absolute activities of the nuclides measured were determined from gross/3 counting and total chain yields were measured relative to 99Mo. The peak to valley ratio was found to be about 310, which is comparable with previous results measured at 10 MeV. Fine structure was found to be a prominent feature and occurred around mass number 133, although mass number 134 could not be measured in the present investigation. The fission yields measured in this work have been compared to all known existing values for work in photon energy range of 9-+ 1 MeV.
ABSTRACT Gamma-ray spectra from the radioactive decay of **1**4**0Ba and **1**4**0La were observe... more ABSTRACT Gamma-ray spectra from the radioactive decay of **1**4**0Ba and **1**4**0La were observed by Ge(Li) spectroscopy. Gamma-ray energies were found to be consistent with literature values, but several of the observed gamma rays were found to have intensities differing significantly from those previously reported. Absolute intensities of prominent gamma rays emitted in the radioactive decay of **1**4**0Ba and **1**4**0La have been measured. The 12. 8-day **1**4**0Ba activity was produced by 14. 8-MeV neutron fission of **2**3**8U followed by radiochemical separation and purification.
The fission yields of 38 mass chains are measured using radiochemical method as well as direct Ge... more The fission yields of 38 mass chains are measured using radiochemical method as well as direct Ge (Li) γ spectrometry. The fission yields are reported for the first time for mass chains 85, 87, 88, 101, 125, 128, 138, 153 and 161. The yields measured make up 114.4% of the total 200% expected from fiission. A fine structure exists at A = 134 and a small fine structure at A = 101-103. Under the light and heavy peak the total yields are both 100.1%. The peak widths taken at half maximum are 16.7 and 15.8 mass units, and the average mass numbers are 97.5 and 139.3 for the light and heavy peak respectively. The ratio of peak to valley is 179 (99Mo/115A).
Applications of High Intensity Proton Accelerators, 2010
This report has as an objective to assess the activation problem of the thorium target irradiatio... more This report has as an objective to assess the activation problem of the thorium target irradiation experiment at FNAL. The results presented are not activation calculation per se, but they provide guidelines to assess any possible impact on the beam stop surroundings due to the irradiation of the target with the low pulse rate 8 GeV proton beam. The average beam intensity is assumed to be 1.32 x10 11 protons per second and a full week of irradiation is assumed.
Industrial & Engineering Chemistry Research, 1999
A flowsheet for the extraction and immobilization of 99 TcO 4from radioactive wastes has been dev... more A flowsheet for the extraction and immobilization of 99 TcO 4from radioactive wastes has been developed. The three-stage flowsheet comprises selective sorption of 99 TcO 4by ABEC resins, secondary concentration of 99 TcO 4from H 2 O by a nonselective silica-based anion-exchange resin, and encapsulation and immobilization of the radionuclide-loaded anion-exchange resin in hydrous titanium oxide microspheres. Each process has been independently tested, and the results are discussed. The utility of this flowsheet in the extraction and immobilization of 99 TcO 4from alkaline radioactive wastes, neutralized nuclear fuel reprocessing streams, alkaline vitrification off-gas scrubber solutions, and solvent wash stages from the treatment of acidic high-level wastes is also presented.
The mass yield distribution of fission products produced in the photofission of 2~U using 9 MeV b... more The mass yield distribution of fission products produced in the photofission of 2~U using 9 MeV bremsstrahlung have been radiochemically measured for 21 mass chains. The absolute activities of the nuclides measured were determined from gross/3 counting and total chain yields were measured relative to 99Mo. The peak to valley ratio was found to be about 310, which is comparable with previous results measured at 10 MeV. Fine structure was found to be a prominent feature and occurred around mass number 133, although mass number 134 could not be measured in the present investigation. The fission yields measured in this work have been compared to all known existing values for work in photon energy range of 9-+ 1 MeV.
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