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Title: Determination of the half-life of the ground state of {sup 229}Th by using {sup 232}U and {sup 233}U decay series

Abstract

The half-life of the ground state of {sup 229}Th ({sup 229}Th{sup g}) has become an important factor in nuclear technology, for example, in the geological disposal of nuclear spent fuel. However, the values reported in two previous studies are not in agreement. This study reevaluates the half-life of {sup 229}Th{sup g} by using a simple and reliable method. The {sup 232}U/{sup 233}U activity ratio of a {sup 232,233}U sample was measured by high-resolution {alpha}-particle spectrometry. Next, the {sup 228}Th/{sup 229}Th{sup g} activity ratio of the Th sample, which was grown from the {sup 232,233}U sample, was also measured. The half-life of {sup 229}Th{sup g} was calculated from these activity ratios, the growth time, and the half-lives of {sup 232}U, {sup 233}U, and {sup 228}Th. From the results of these five measurements, the half-life of {sup 229}Th{sup g} is determined to be 7932 {+-} 55 yr at a confidence level of 2{sigma}.

Authors:
 [1];  [2]; ;  [3];  [4];  [1]
  1. Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)
  2. (Japan)
  3. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550 (Japan)
  4. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi 980-8577 (Japan)
Publication Date:
OSTI Identifier:
21596562
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.84.014316; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; GROUND STATES; GROWTH; HALF-LIFE; NUCLEAR DECAY; RESOLUTION; SPECTROSCOPY; SPENT FUELS; THORIUM 228; THORIUM 229; URANIUM 232; URANIUM 233; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; DECAY; ENERGY LEVELS; ENERGY SOURCES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; FUELS; HEAVY ION DECAY RADIOISOTOPES; HEAVY NUCLEI; ISOTOPES; MATERIALS; NEON 24 DECAY RADIOISOTOPES; NUCLEAR FUELS; NUCLEI; RADIOISOTOPES; REACTOR MATERIALS; SPONTANEOUS FISSION RADIOISOTOPES; THORIUM ISOTOPES; URANIUM ISOTOPES; YEARS LIVING RADIOISOTOPES

Citation Formats

Kikunaga, H., Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Suzuki, T., Nomura, M., Mitsugashira, T., and Shinohara, A. Determination of the half-life of the ground state of {sup 229}Th by using {sup 232}U and {sup 233}U decay series. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.014316.
Kikunaga, H., Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Suzuki, T., Nomura, M., Mitsugashira, T., & Shinohara, A. Determination of the half-life of the ground state of {sup 229}Th by using {sup 232}U and {sup 233}U decay series. United States. doi:10.1103/PHYSREVC.84.014316.
Kikunaga, H., Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Suzuki, T., Nomura, M., Mitsugashira, T., and Shinohara, A. Fri . "Determination of the half-life of the ground state of {sup 229}Th by using {sup 232}U and {sup 233}U decay series". United States. doi:10.1103/PHYSREVC.84.014316.
@article{osti_21596562,
title = {Determination of the half-life of the ground state of {sup 229}Th by using {sup 232}U and {sup 233}U decay series},
author = {Kikunaga, H. and Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198 and Suzuki, T. and Nomura, M. and Mitsugashira, T. and Shinohara, A.},
abstractNote = {The half-life of the ground state of {sup 229}Th ({sup 229}Th{sup g}) has become an important factor in nuclear technology, for example, in the geological disposal of nuclear spent fuel. However, the values reported in two previous studies are not in agreement. This study reevaluates the half-life of {sup 229}Th{sup g} by using a simple and reliable method. The {sup 232}U/{sup 233}U activity ratio of a {sup 232,233}U sample was measured by high-resolution {alpha}-particle spectrometry. Next, the {sup 228}Th/{sup 229}Th{sup g} activity ratio of the Th sample, which was grown from the {sup 232,233}U sample, was also measured. The half-life of {sup 229}Th{sup g} was calculated from these activity ratios, the growth time, and the half-lives of {sup 232}U, {sup 233}U, and {sup 228}Th. From the results of these five measurements, the half-life of {sup 229}Th{sup g} is determined to be 7932 {+-} 55 yr at a confidence level of 2{sigma}.},
doi = {10.1103/PHYSREVC.84.014316},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}