| 摘要 |
PROBLEM TO BE SOLVED: To readily measure the pressure of enclosed gas in an airtight vessel, without requiring large-scale facilities. SOLUTION: This apparatus is for non-destructively measuring the pressure of the gas 2 enclosed in the airtight vessel 1, and is provided with a radiation source 4 for making an irradiation route 3 determined so as to permeate the enclosed gas 2 in the airtight vessel 1 irradiated with measuring radiation, and a radiation detector 5 for detecting measuring radiation having permeated the irradiation route 3. The relation between the pressure of the enclosed gas 2 and attenuation of the measuring radiation concerning the irradiation route 3 is found beforehand, actual attenuation of the measuring radiation, having permeated the irradiation route 3 is measured, based on the output of the radiation detector 5, and based on that measurement result, the relation the pressure of the enclosed gas 2 is identified. COPYRIGHT: (C)2005,JPO&NCIPI
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