公开(公告)号：US12085682B2

公开(公告)日：2024-09-10

申请号：US17614410

申请日：2020-05-18

Applicant: HITACHI, LTD.

Inventor： Shuichi Hatakeyama ,  Kouichi Okada ,  Katsunori Ueno ,  Takahiro Tadokoro ,  Yuichiro Ueno ,  Tooru Shibutani ,  Keisuke Sasaki

IPC: G01T1/24 ,  G01T1/02 ,  G01T1/36 ,  G01T3/08

CPC classification number: G01T1/247 ,  G01T1/023 ,  G01T1/366 ,  G01T3/085

Abstract: A radiation monitoring device realizes a high measurement function. Therefore, a radiation monitoring device includes: a radiation detection unit including a phosphor that emits light by incident radiation; a photodetector that converts a single photon or a photon group having a plurality of the single photons generated by the radiation detection unit into an electric pulse signal; and an analysis unit that analyzes the electric pulse signal. The phosphor emits light based on a plurality of light emission phenomena having different decay time constants. The analysis unit includes: a signal discrimination circuit that discriminates the electric pulse signal output from the photodetector; a dose rate calculation circuit that calculates a dose rate of the radiation based on a count rate of the discriminated electric pulse signal; and an application energy calculation circuit that calculates application energy of the radiation based on a peak value of the discriminated electric pulse signal.

公开(公告)号：US11493648B2

公开(公告)日：2022-11-08

申请号：US17276957

申请日：2019-08-02

Applicant: HITACHI, LTD.

Inventor： Takahiro Tadokoro ,  Yuichiro Ueno ,  Katsunori Ueno ,  Kouichi Okada ,  Shuichi Hatakeyama ,  Yasushi Nagumo ,  Tooru Shibutani ,  Keisuke Sasaki ,  Akira Oozone

IPC: G01T1/20 ,  G01T1/202 ,  G01T1/208 ,  G01T3/06

Abstract: A radiation monitor includes a radiation detection unit detecting radiation, and an optical fiber transmitting photons emitted from a light emitting element of the radiation detection unit, wherein the radiation detection unit includes a first light emitting element generating a photon in response to incident radiation, a chemical compound part having chemical compounds which generate charged particles by nuclear reactions with incident neutrons, and a second light emitting element being located between the first light emitting element and the chemical compound part and generating a photon in response to radiation.