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Highly-Enriched Actinide and Stable Isotopes for Scientific Research in Russian Federal Nuclear Center

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Highly-Enriched Actinide and Stable Isotopes for Scientific Research in Russian Federal Nuclear Center AU9817359 Highly-Enriched Actinide and Stable Isotopes for Scientific Research in Russian Federal Nuclear Center S.P.VESNOVSKII Russian Federal Nuclear Center - All-Union Experimental Physics Research Institute 607190, Sarov (Arzamas-16), Nizhny Novgorod region, Russia SUMMARY. The report presents information and capabilities of production on highly enriched stable and actinide isotopes for scientific research and applied utilization. Electromagnetic separator and ra- diochemical methods provide obtaining of superpure isotope samples for nuclear-physical experiments, for manufacturing standard materials and radiation sources used in calibrating of radiometric and mass-spectrometric equipment, and also as tracers when analyzing environmental contamination. The data on nomenclature of stable and highly enriched isotopes produced and delivered is presented. The brief information on the possibilities of manufacturing targets, layers and also sources containing highly enriched and superpure isotopes is given. 1. INTRODUCTION • Design and creation of the laboratory ex- perimental base for nuclear physics research on The Russian Federal Nuclear Center founded in the basis of electrophysics and nuclear physics 1946 to design Russian nuclear weapons has facilities, using radioisotopes. turned into the largest scientific research center, • Study of possibility of transuranium ele- to great extent influencing the modern science ments transmutation, the latter containing in development in the various fields of the funda- radioactive wastes of nuclear power engineer- mental and applied research. The research in the ing, measurements of nuclear constants, neces- field of experimental nuclear physics performed sary for transmutation process development. on the experimental base and measuring tech- Monitoring of environmental contamination nique concentrated in the Center for nuclear and (soil, underground waters, etc.) with actinide radiation research are of great importance in elements, creation of technology for the con- RFNC activities. taminated areas, decontamination, monitoring of residual actinide content. The main fields of the research are as follows: • Study of fission and fusion nuclear reac- To provide this research program, the actinide tions, measurement of nuclear data for a wide isotopes electromagnetic separation laboratory range of elements and construction materials, that operates a mass-separator, S-2 type, measurement of critical mass, study of critical equipped with personnel radiation protection to mass configurations, measurement of integral produce superpure isotopes of uranium, pluto- nuclear constants. nium, americium and curium was set up in • Creation, development and application tech- 1967 in the Radiochemical Department. There niques of radiation characteristics measurement is also a group dealing with production of lay- for pulse and stationary regimes. ers and targets of these isotopes for nuclear • Research in the field of radiochemistry, physics experiments. The isotope production of mass-spectrum and isotope analyses using su- the Radiochemical Department was delivered to perpure actinide isotopes, including transura- different Russian research institutes to perform nium elements, development of radiochemical the state program on nuclear constants meas- measurement techniques and technologies for urements for actinide elements. Not long ago different purposes. this production became available for the foreign laboratories, as well. Table 1. Basic parameters of the S-2 mass separator Magnetic field form H=H0ro/r Average trajectory radius, r0 1000 mm Average intensity of magnetic field, Ho 4500 Oe 114.6° (2 rad) Ion beam angle in magnetic field Total length of average trajectory 6000 mm Dispersion for 1 % relative mass difference 20 mm Accelerating voltage up to 45 kV Ion source plasma-type with filamentary longitudi- nal cathode, bicrucible Maximum temperature of crucibles 1000°C Crucible capacity (large) lOg (small) Ig Ion source current up to 10 mA Isotope receiver slit-type with a variable number of boxes Material utilization factor during separation -5% Evacuation system four steam-oil apparatus of 5000 1/s pumping rate and mechanical pumps Working vacuum 2-10"6-10-5Torr Electromagnet weight 18 t Power 50 kW 2. THE MAIN CHARACTERISTICS OF S- nected with chromatism and dispersion in the 2 MASS-SEPARATOR electromagnetic system of S-2 installation. The main characteristics of mass separator S-2 3. THE NOMENCLATURE OF THE ISO- are described in a series of publications and are TOPES PRODUCED. shown in table 1. As the working substance in the ionic source of S-2 mass-separator the an- To certify the highly-enriched preparations pro- hydrous trichlorides of the actinide elements duced, the methods of mass- and alpha- used in the amount of about 1 gram are utilized. spectrometry are used. The mass-spectrometer The efficiency of the working substance appli- MI3340 type with the source of thermal ioniza- cation in the one separation cycle is in the aver- tion allows to determine isotope contamination age about 5% of the initial mass, all the iso- at the level of 5-10'7, the sensitivity of the topes of the element separated accumulating analysis for uranium being 1500 atoms/ion. The simultaneously in the isotope receivers. The accuracy of the isotope analyses reaches 0.1% mass-separator configuration envisages the pos- relat.( 2v ) for ratios > 10"2, and 1-3% relat.(2v) sibility of the dispersed substance collection for ratios<10'4. To determine isotopes like 232U, from the inner surfaces, thus, from 50 % to 236Pu, 238Pu, 242Cm, 244Cm, alpha-spectrometry 80% of the initial mass can be reused for sepa- methods are applied in the highly enriched ration. The enriched isotopes are accumulated preparations. in the receivers made of superpure copper or aluminium. The isotopes are collected with the For some nuclear-physical experiments it is es- help of the nitric or hydrochloric acids. The ra- sential to possess isotopes preparations of high diochemical methods provide obtaining super- chemical purity, the content of contamination pure preparations, free from mould materials being at the level not more than 10'7-10'8. The and radioactive contamination by the other ele- methods developed in the Radiochemical De- ments, the chromatographic and extraction partment provide such a degreee of purification methods to determine the separating substance from contamination with the other actinides. content being used. The quality of the isotopes The content of the other elements in the prepa- enriched and the isotopes contamination con- rations delivered is not more than 0.1 %. The tent are determined only by the effects con- monitoring of Table 2. Isotope contents of highly enriched samples Isotope Main isotope contents and impurities (as atoms. %) Uranium 232 233 234 235' 236 238 U-233 0.5-10"3 act. 99.97 0.03 0.1-10"2 <10"3 0.1-10"2 U-234 15.3 84.52 0.13 1.3- 10"3 4-10"2 U-235 1.7-10"4 2.6-10"3 99.9923 4.5-10"3 4.3-10"4 U-236 < 1.27-10"2 1.41 97.81 0.763 U-238 < 1.8-10"* <1.58-1Q-4 <4.03-10"4 <2.82-10"4 99.9990 Isotope Main isotope contents and impurities (as atoms. %) Neptunium 236 237 Np-237 <0.01 99.99 Isotope Main isotope contents and impurities (as atoms. %) Plutonium 238 239 240 241 242 244 Pu-238 99.6 0.4 0.015 Pu-239 99.5 0.5 99.997 2-10"3 2-10"4 M0"4 Pu-240 4-10-3 99.9 6-10'2 3-10"2 90.7 0.2 Pu-241 <10"3 0.17 99.6 0.23 <10"3 <10"4 3-10-4 99.998* 1.610"3 <10"4 3 Pu-242 io- 0.1 2.0 97.8 7-10"4 5-10"4 5-10"4 0.04 99.96 5-10"4 Pu-244 5-10'2 0.4 5-10"2 1.8 97.8 3-10"4 0.3 7-10° 0.7 98.9 Isotope Main isotope contents and impurities (as atoms. %) Americium 241 242m 243 Am-241 99.99 Am-242m 30.5 55.1 18.2 13.0 85.6 1.6 Am-243 0.7 0.1 99.2 1.6-10"3 4-10"4 99.998 Isotope Main isotope contents and impurities (as atoms. %) Curium 243 244 245 246 247 248 2 Cm-243 93.3 0.6 4-10"4 0.6 <10~2 <io- 4 99.99* 8-10"3 5-105 io- <10"4 <10"4 2 Cm-244 1.5-10"2 99.3 6-10"2 4-10"3 <10"3 <io- Cm-245 1.3 98.4 0.3 6-10"3 99.998* 2.5103 Cm-246 <10"2 6 98.0 <10"2 <102 <10"2 8-10'3 99.8 <10"2 <10"2 Cm-247 0.5 12 7 7 72.3 1.4 2.7 0.8 5 90.2 0.5 Cm-248 0.1 2.8 0.04 1.24 0.1 0.1 1.7 0.7 97.5 chemical contamination is exercised through the lines *) the characteristics of the prepara- mass-spectrometer usage with a spark ionic tions obtained by the double fusion process are source and absolute measurements of contami- shown. To monitor the environmental contami- nators concentration. nation and purification technologies, the fol- The nomenclature of the isotopes delivered and lowing superpure isotopes are suggested (see their characteristics are shown in the table 2. In table 3.): Table 3. Isotopic contain of uranium, plutonium and americium tracers for environment measurements Uranium-233 99,9472% (mass) Uranium-232 (0,5 ±0,1) -10-3% Uranium-234 (0,503510,0019) -10-'% Uranium-235 (0,108±0,002) -10-2% Uranium-238 (0,133+0,002) -10-2% Plutonium-242 99,98% (mass) Plutonium-238 (5±1) -10"5% Plutonium-239 (6+1) -10"3% Plutonium-240 (7±1) -lO^/o Plutonium-241 (8±1) -10"3% Plutonium-242 <(2±1) -lO^/o Americium-243 99,998% (mass) Americium-241 (l,6±0,4) -10-3% Americium-242m (4 ±1) -lO^/o Curium-244 <(7 ±2) -10"2%(act.) The technologies of the plotting uranium and 4.
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