| 摘要 |
The present invention relates to a sealed vessel and a method of testing air tightness of the vessel. In the sealed vessel, the vessel body and a lid are sealed with two O-rings. The sealed vessel has a hole communicating the space sandwiched by the O-rings and the outside of the sealed vessel and a hole communicating the inside and outside of the sealed vessel. In case of testing the air tightness of the inner O-ring, gaseous helium is injected into the space sandwiched by the O-rings and the gaseous helium spread into the vessel is measured. In case of testing the air tightness of the outer O-ring, the vessel is pressurized by the gaseous helium from the outside and the gaseous helium spread in the space sandwiched by the O-rings is measured.
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