Search for the decay of 229mTh by photon detection

Y. Kasamatsu, H. Kikunaga, K. Takamiya, T. Mitsugashira, T. Nakanishi, Y. Ohkubo, T. Ohtsuki, W. Sato, A. Shinohara

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


A search for the isomeric transition of 229mTh at 3.5 eV was made by photon detection with a low-noise photomultiplier for samples prepared by a rapid chemical separation from the parent nuclide 233U by means of an anion exchange method. The photon emission caused by the disintegration of 229mTh was not observed for 229Th nitric acid solution samples. From the experimental results, the limits of the half-life of 229mTh as dissolved in HNO3 solution are discussed.

Original languageEnglish
Pages (from-to)511-514
Number of pages4
JournalRadiochimica Acta
Issue number9-10
Publication statusPublished - 2005
Externally publishedYes


  • Decay property
  • Electronic bridge
  • Half-life
  • Isomer
  • Isomeric state
  • Thorium-229m

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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