Optical fiber light emitter, light emitter bundle, radiation measuring device, and method for manufacturing an optical fiber light emitter

A method for manufacturing an optical fiber emitter, the method comprising:

• preparing a cylindrical cladding;
• forming a melt by melting a halide having a melting point lower than that of a material constituting the cladding;
• accommodating the melt in the cladding;
• and
• forming an optical fiber emitter whose core is made of a crystal of the halide by cooling and solidifying the melt accommodated in the cladding to form the crystal of the halide, the crystal of the halide configured to emit light by being irradiated with radiation.

A method for manufacturing an optical fiber emitter, the method comprising:

• accommodating in a cylindrical cladding a core material constituted by a halide having a melting point lower than that of a material constituting the cladding;
• melting the core material accommodated in the cladding;
• and
• forming an optical fiber light emitter whose core is made of a crystal of the halide by cooling and solidifying the molten core material to form the crystal of the halide, the crystal of the halide configured to emit light by being irradiated with radiation.

An optical fiber light emitter comprising:

• a core constituted by a scintillator;
• and
• a cladding, wherein
• the core and the cladding have a thermal expansion coefficient difference of a value 60×10−6/K or less and a thermal conductivity difference of a value 30 W/m/K or less.

An optical fiber emitter comprising:

• a core constituted by a eutectic having two crystalline phases;
• and
• a cladding, wherein
• at least one of the crystalline phases emits light by being irradiated with radiation.

A radiation measuring device comprising:

• an optical fiber light emitter including a core constituted by a scintillator that emits light by being irradiated with radiation, and a cladding surrounding the core;
• a first sensor for detecting light reaching one end side of the optical fiber emitter;
• a second sensor for detecting light reaching the other end side of the optical fiber emitter;
• and
• a calculation circuit for obtaining an incident position of radiation in the optical fiber emitter by at least one of a difference in light detection time and a difference in the detected amount of light, between the first sensor and the second sensor.