Low profile ionization chamber
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United States of America Patent
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Jan 5, 1999
Grant Date -
N/A
app pub date -
Apr 23, 1997
filing date -
Apr 23, 1997
priority date (Note) -
Expired
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Abstract
A very low profile ionization chamber provides increased operating current by using alpha particle emitting isotopes having low emission energies as an ionization source. The chamber includes a cylindrically shaped housing having height generally equal to a radius thereof. A conically shaped sensing electrode is carried within the housing. The housing is closed at one end by a main field electrode and at the other end by an insulating closure panel. A second field electrode is carried on the closure panel. The second field electrode also carries the ionization source. The conically shaped sensing electrode has an open central region which permits alpha particles to travel therethrough toward the first field electrode. The first field electrode could either exhibit a conical cross-section or could be planar. A chamber height on the order of 1.5 to 2 centimeters and a diameter in a range of 3-4 centimeters with a Gd148 source produces operating currents on the order of 10 pA.
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