US PATENT SUBCLASS 324 / 469
.~.~ Using a radioactive substance

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

459  DF  USING IONIZATION EFFECTS {2}
464  DF  .~ For analysis of gas, vapor, or particles of matter {6}
469.~.~ Using a radioactive substance

DEFINITION

Classification: 324/469

Using a radioactive substance:

(under subclass 464) Subject matter wherein a radioactive material is used to ionize the gas, vapor, etc., to be analyzed.