Properties of Transuranium Radionuclides
Transuranium Radionuclides: Producing Highly Enriched Isotope Samples, Measuring Emission Probabilities of Radiations and Decay Data Evaluation
Tech Area / Field
- PHY-ANU/Atomic and Nuclear Physics/Physics
3 Approved without Funding
Khlopin Radium Institute, Russia, St Petersburg
- VNIIEF, Russia, N. Novgorod reg., Sarov\nMendeleev Institute of Metrology, Russia, St Petersburg
- HMS SULTAN, UK, Gosport\nCEA / DTA / DAMRI/CEN Saclay, France, Saclay
Project summaryThe objective of the "RADIONUCLIDE" project is to obtain the experimental and evaluated decay data of the transuranium radionuclides, which have many uses in science and technology. The evaluated data resulting from this work are intended for use in the International Nuclear Database being developed under the auspices of IAEA. Technical Approach and Methodology. The experimental part of the project includes: (1) producing highly enriched samples of transuranium isotopes of Np, Pu, Am, Cm, (2) making layers and targets of them and (3) measuring relative and absolute emission probabilities of alpha-, gamma-radiations in the decays of transuranium radionuclides. The current calibrated spectrometric equipment along with the currently available technique procedures will be employed to carry out the experimental studies of radiation spectra. For determination of the radionuclide activity in sources there will be used absolute measurement methods including a technique of calorimetry.
The computational-analytical part of the project includes obtaining re-evaluated data for decay characteristics of wide scope for 20 transuranium radionuclides. The values of the following decay characteristics shall be evaluated for each radionuclide: half-life; decay branching fractions; Q-values; energies and absolute and relative intensities of alpha-, beta-, gamma-radiations, conversion and Auger electrons; averaged energies of radiations per decay; ionization gamma-constant (kerma-constant). Based on the published experimental data as well as the experimental findings, that will be obtained in this work, the performance of the evaluation of the decay data of the transuranium radionuclides will be realized in accordance with the methodology that was agreed upon by IAEA-CRP participants and other specialists at the IAEA Meeting in Vienna 24 -28 October, 1994, and 24-25 November, 1997. Also the experience of the participants of this project at the KRI who created the five Russian books of the recommended reference decay data for 300 applied radionuclides will be used.
Experimental data will be obtained for the relative and absolute emission probabilities of alpha-, gamma-radiations of transuranium radionuclides including isotopes of 238Np, 241Am, 242mAm, 243-248Cm. The final list of radionuclides and characteristics for measurements will be formed taking into account of the status of the existing data. Measurements will be carried out in those cases when the available data are either discrepant or of inadequate accuracy. With the aim of updating the recommended data the new evaluated data will be obtained for 20 transuranium radionudides including those listed in IAEA Technical Report Series No. 261 (1986): 237,239Np, 238-242Pu, 241-243Am, 242,244Cm, 252Cf.
The economic efficiency of this work is defined by the creation of the evaluated data of those most-used radionuclides for which use of inaccurate values of the decay characteristics can lead to the certain economic and technologic losses. One of the important applied intentions of this research proposal can be connected with working out the system of reliable "gamma marks" for a control of unspreading transuranium materials.
Potential Role of Foreign Collaborators:
- cooperative determination of the list radionudides of primary importance and the list of the most useful decay characteristics;
- the participation in the international inlercomparisons of the results of the experimental studies of decay characteristics of the transuranium radionudides using the highly enriched isotope samples produced in the present work;
- providing the cooperative activity in order to arrive at a common understanding of the methodology of the evaluation and to co-ordinate the evaluation activities in different countries.
For participation in the project the collaborators are invited:
- research laboratories and institutes,
- private firms,
- inpidual experts from the European Community, Japan, Norway, USA.
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