The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 2020
Filed:
Aug. 08, 2017
Hitachi, Ltd., Tokyo, JP;
Takahiro Tadokoro, Tokyo, JP;
Katsunori Ueno, Tokyo, JP;
Yuichiro Ueno, Tokyo, JP;
Kouichi Okada, Tokyo, JP;
Shuichi Hatakeyama, Tokyo, JP;
Yasushi Nagumo, Tokyo, JP;
Yoshinobu Sakakibara, Tokyo, JP;
Toru Shibutani, Tokyo, JP;
Takahiro Itou, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
Provided is a radiation monitor, including: a radiation detection unit which includes a radiation detection element, the radiation detection element emitting light of a predetermined light emission wavelength; a light emission unit which emits light of a wavelength different from the light emission wavelength; a wavelength selection unit which passes the light of the light emission wavelength, and is set to a first mode to block the light from the light emission unit; an optical transmission line which transmits the light; a light detection unit which converts the light passing through the wavelength selection unit into an electric pulse; and a control unit which measures a count rate of the electric pulse, and determines whether at least the light emission unit is degraded on the basis of the count rate and a light intensity of the light emission unit.