Gamma-ray liquid level meter is a useful apparatus as liquid level measuring equipment. Ordinary type level meter has lots of difficulties in measuring liquid level.
This paper has the following contains;
(1) At first, I give some informations with regards to several types of the liquid level meter such as floating, penetrating and iso-sensitive types and each static characters.
(2) I study response characters between the input and output signals of the gamma-ray liquid level meter when liquid level in the vessel moves up and down..
(3) Finaly, I discuss how to determine the counting rate and the time constant of the radioactive measuring apparatus, in considering the statistical deviation of radioactivity from radioactive source and the resolution time of radiation detector.
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