Identifying and quantifying the presence of alpha radiation and

Details Identifying and quantifying the presence of alpha radiation and Identifying and quantifying the presence of alpha radiation and

1990-07-25

1992-10-06

Wieder, Kenneth A.

Electricity: measuring and testing

Using ionization effects

For analysis of gas, vapor, or particles of matter

342464, 250384, G01N 2766

Patent

active

051535203

ABSTRACT:
Means and methods of detecting particular particles in an air stream at very low concentration levels and identifying the particles and magnitude of concentration are afforded. Thus, a particle detector cell has a source of ionizing radiation of constant magnitude, an anode and cathode for moving ions through a radiation activity region and a detector electrode for capturing and measuring free electrons as a dynamic signal indication of the presence of particular particles in the activity region. Particular gas molecules are identified by their fingerprint, namely a spectral response to resonating frequency of electrons orbiting in their molecular structure. The magnitude of free electrons detected determine the concentration of the particles present in air. The output may be recorded on a strip chart for identification and quantification or may be logged in a digital computer. The computer may organize a frequency scanning procedure correlated with dynamic free electron activity for digital storage and recall, and for comparison with spectrum tables for identification of molecules present in an air stream. The detector is very sensitive to low concentration levels of particles such as a few microcuries of alpha particles per liter of air, with equivalent detection of particular gas molecules which can be ionized in the presence of r-f fingerprinting frequencies.

REFERENCES:
patent: 4041376 (1977-08-01), Furuto et al.
patent: 4053825 (1977-10-01), Young
patent: 4705947 (1987-11-01), Ramsey et al.

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