US 12,085,682 B2
Radiation monitoring device
Shuichi Hatakeyama, Tokyo (JP); Kouichi Okada, Tokyo (JP); Katsunori Ueno, Tokyo (JP); Takahiro Tadokoro, Tokyo (JP); Yuichiro Ueno, Tokyo (JP); Tooru Shibutani, Tokyo (JP); and Keisuke Sasaki, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Appl. No. 17/614,410
Filed by HITACHI, LTD., Tokyo (JP)
PCT Filed May 18, 2020, PCT No. PCT/JP2020/019634
§ 371(c)(1), (2) Date Nov. 26, 2021,
PCT Pub. No. WO2020/241352, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 2019-098193 (JP), filed on May 27, 2019.
Prior Publication US 2022/0236430 A1, Jul. 28, 2022
Int. Cl. G01T 1/24 (2006.01); G01T 1/02 (2006.01); G01T 1/36 (2006.01); G01T 3/08 (2006.01)
CPC G01T 1/247 (2013.01) [G01T 1/023 (2013.01); G01T 1/366 (2013.01); G01T 3/085 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A radiation monitor device comprising:
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;
a signal discrimination circuit coupled to the photodetector;
a dose rate calculation circuit coupled to the signal discrimination circuit; and
an application energy calculation circuit coupled to the signal discrimination circuit,
wherein the phosphor emits light based on a plurality of light emission phenomena having different decay time constants, and
wherein the signal discrimination circuit discriminates the electric pulse signal output from the photodetector by determining whether the electric pulse signal is of a signal of a photon group or of a single photon,
wherein the dose rate calculation circuit calculates a dose rate of the radiation based on a count rate of the discriminated electric pulse signal, and
wherein the application energy calculation circuit calculates an application energy of the radiation based on a peak value of the discriminated electric pulse signal.