Kuraray Co., Ltd.

Masashi Akari

Katsuhiro Fujita

Hiroshi Ozawa

Takuro Niimura

Ryuichi Iwakawa

A plastic wavelength shifting fiber includes a core containing a fluorescent agent having a peak of a fluorescence spectrum in a wavelength range of 450 to 550 nm, and a cladding covering an outer peripheral surface of the core and has a refractive index lower than that of the core. A sum of the number of carbon and oxygen atoms of the fluorescent agent is 10 to 25, and a quantum yield QE of the fluorescent agent and an overlap parameter OL thereof defined by Formula (2) satisfy Formula (1):×(1−)<0.07  Formula (1) here, Abs(300+2×i) is a relative intensity of an absorption spectrum normalized so that its peak intensity becomes 1; Flu(300+2×i) is a relative intensity of a fluorescence spectrum normalized so that its peak intensity becomes 1; and i is a variable that increases from 0 to 200 by 2 at a time.

Plastic wavelength shifting fiber

The present invention provides a multilayered acrylic polymer coagulate characterized in that the coagulate has a bulk density of 0.3 to 0.6 g/cmand a median diameter of 50 to 400 μm and contains particles having a particle diameter of 75 or less in a proportion of 50% or less, and the amount of alkali metal and alkaline earth metal contained in the coagulate satisfies the following formula (1):Σ()×(120−)≤100  (1)wherein

Acrylic polymer coagulates

A plastic scintillating fiber capable of detecting radiation having a weakly penetrating property is provided. A plastic scintillating fiber according to an aspect of the present invention includes a plastic optical fiber, and further includes a core containing at least one type of a fluorescent agent, a cladding layer having a refractive index lower than that of the core disposed at a center, and an outermost layer covering an outer peripheral surface of the cladding layer. The outermost layer contains a base material that generates scintillation light, and at least one type of a fluorescent agent that converts the scintillation light into light having a wavelength longer than that of the scintillation light.

Growing community of inventors

Niigata, Japan

Masashi Akari