Measurement of the specific activity of 39Ar in natural argon

P. Benetti, F. Calaprice, E. Calligarich, M. Cambiaghi, F. Carbonara, F. Cavanna, A. G. Cocco, F. Di Pompeo, N. Ferrari, G. Fiorillo, C. Galbiati, L. Grandi, G. Mangano, C. Montanari, L. Pandola, A. Rappoldi, G. L. Raselli, M. Roncadelli, M. Rossella, C. RubbiaR. Santorelli, A. M. Szelc, C. Vignoli, Y. Zhao

Research output: Contribution to journalArticlepeer-review

107 Scopus citations


We report on the measurement of the specific activity of 39Ar in natural argon. The measurement was performed with a 2.3-l two-phase (liquid and gas) argon drift chamber. The detector was developed by the WARP Collaboration as a prototype detector for WIMP Dark Matter searches with argon as a target. The detector was operated for more than two years at Laboratori Nazionali del Gran Sasso, Italy, at a depth of 3400 m w.e. The specific activity measured for 39Ar is 1.01 ± 0.02 (stat) ± 0.08 (syst) Bq per kg of natAr.

Original languageEnglish (US)
Pages (from-to)83-88
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
StatePublished - Apr 21 2007

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


  • Ar specific activity
  • Cosmogenic activation
  • Low-background experiments


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