Japan Atomic Energy Agency

Sun-Nanotechnology Co., Ltd.

Junichiro Kamiya

Shogo Nasu

Oji Koizumi

Provided is a vacuum component capable of evacuation by a getting effect, which has a large maximum number of captured molecules and a long working life. It is provided, in an area around its central axis, with a hollow cylindrical electrodehaving an electrode surfaceA that is sufficiently smaller than an inner surfaceA of the vacuum container, along the central axis. In the vacuum container, it is possible to realize any one of states among a first state of generating DC discharge by introducing Ar into the inside and setting the electrode surfaceA at a positive potential, a second state of setting the electrode surfaceA at a ground potential without introducing Ar, and a third state of generating DC discharge by introducing Ar into the inside and setting the electrode surfaceA at a negative potential. Evacuation by the vacuum componentis performed in the second state. Further, evacuation by the vacuum componentis performed also by realizing a state of performing a heating process at 400&#xb0; C. or below without using the electrode.

Vacuum component and evacuation method using the same

A radiation shielding material that is lighter and has lower installation restrictions than conventional methods, and that exhibits excellent shielding efficiency against radiation in the high energy region. The radiation shielding material comprises a complex containing a fibrous nanocarbon material, a primary radiation shielding particle, and a binder, wherein the fibrous nanocarbon material and the primary radiation shielding particle are dispersed in the binder.

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Ibaraki, Japan

Junichiro Kamiya