Helium Detection Measurement

  1. Can someone recommend (if possible) a way to detect the amount of helium in a given enclosed space? I'm designing an experiment in which I will need to measure the amount in an otherwise vacuum.
     
  2. jcsd
  3. russ_watters

    Staff: Mentor

    If helium is the only thing in the container, why not just measure the pressure?
     
  4. How to detect the amount depends on the quality of the vacuum and the level of helium in that volume.

    Normal Helium mass spectrometer/RGA leak detection methods will work and can be fairly accurate if you have a calibrated measurement device or a calibrated leak to use as a standard.

    Find a copy of 'A User's Guide to Vacuum Technology by John F. O'Hanlon" for measurement details.

    http://www.lesker.com/newweb/Techni...etect_01_Overview.cfm?section=leaks&init=skip
     
  5. Gas Chromatograph or Mass Spectrometer (RGA)
     
  6. Oops. Forgot to mention that the experiment would involve the alpha decay of a radioactive source, hence, I need a way to differentiate between alpha particles and helium.
     
  7. That's out of my level of expertise but to detect helium with a mass spectrometer/RGA you need to ionize it first so it can be accelerated into the mass detector. For charged particles like alphas a silicon detector could be used.

    http://www.ortec-online.com/Solutions/RadiationDetectors/silicon-charged-particle-detectors.aspx
     
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