Abstract: Siloxane compounds are removed from the atmospheres by silica supporting an organic sulfonic acid compound. The silica with the organic sulfonic acid compound has a specific surface area down to 500 m2/g and up to 750 m2/g and a pore volume down to 0.8 m3/g and up to 1.2 m3/g, both measured by nitrogen gas adsorption method and has a pore diameter down to 4 nm and up to 8 nm, at the peak of differential pore volume measured by nitrogen gas adsorption method. The durability of gas sensing element against siloxanes is improved.

Abstract: A target is provided herein such that the radioactivation of a member thereof due to protons may be reduced. In order to reduce the radioactivation of the member due to protons, a novel target composed by compositing a beryllium material (or lithium material) and a nonmetal material is used.

Abstract: The present invention provides a target capable of reducing radioactivation of a member due to protons. The present invention uses a novel target configured by compositing a beryllium material or a lithium material and a carbon-series material for reducing the radioactivation of the member due to the protons.

Abstract: An X-ray fluorescent spectrometer uses a screen which restricts a field of view to a local portion of a specimen irradiated by X-rays from an X-ray tube. Fluorescent X-rays from the specimen from the local portion and passing through the screen are collimated, dispersed and analyzed. A control unit controls a rotating mechanism to rotate the specimen or its container around a predetermined axis and also a moving mechanism to linearly move the screen such that the local portion to be analyzed and a throughhole of a proper size therefor can be brought adjacent each other. Data on the positions of local portions to be analyzed on the specimen can be inputted through an input unit. Effects of variations in detection results due to different distances between the analyzed local portions and the axis of rotation can be compensated for by storing reference data obtained from a standard sample in a data processing unit.