INFICON CMS5000 Monitoring System - Manual (Page 17)

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CMS5000 Operating Manual
When an organic molecule (R) enters the detector, it collides with the metastable
argon (Ar*). During this collision, energy is released to the organic molecule. Since
the ionization potential of most organic compounds is less than 11.7 eV, the
metastable argon atoms will ionize them, producing positive ions and electrons.
The reaction is illustrated as follows:
Ar* + R

Ar + R + e
-
High voltage applied across the detector produces a current, which is amplified and
measured to produce a chromatogram.
1.4 Radioactive Source
The MAID in the CMS5000 contains a radioactive isotope in a solid form of Ni-63,
with an activity level of up to 2.4 millicuries. The half-life of Ni-63 is approximately
96 years. The source of the radioactivity is sealed within a stainless steel cylinder
which is located within the detector cavity. Per New York State radioactive materials
license regulations, a wipe test is required for the Ni-63 source every 36 months.
The first test is completed at the factory prior to shipment.
WARNING
No repair of the detector cell should be performed by the
user. If the detector cell does not exhibit an electronic
signal, the isotope may require replacement. Contact
INFICON for repair or replacement of the detector cell.
The State of New York Department of Labor, Division of Safety and Health and the
United States Nuclear Regulatory Commission under either a Specific License or a
General License authorizes possession and use of the radioactive source in the
instrument. A copy of the terms and requirements of a General Licensee (section
12 NYCRR, part 38:41, table 3, item b) accompanied INFICON transfer of this
instrument. The safety requirements of the Specific License or General License are
designed to protect the user and the public from unnecessary prolonged exposure
to radiation. Following these requirements is imperative.