To provide a fluorescent material having a short fluorescent life and composed of a light element, as a fluorescent material for detecting a neutron, which is required for a high counting rate, a wide neutron energy range and low gamma-ray detecting characteristics.
The fluorescent material for detecting a neutron, having a short fluorescent life and a high neutron-capturing efficiency, and composed of the light element, is obtained by blending a phosphor of improved in fluorescent life characteristics by adding ≥10 ppm and ≤50 ppm of Ni (nickel) as a co-activator to a blue phosphor ZnS:Ag, with a neutron converter containing 6Li of an isotope of Li (lithium), having a large neutron-capturing cross-sectional area, or 10B of an isotope of B (boron). The detection of a neutron is carried out by utilizing light emission from the phosphor powder which is excited with ionizing radiations emitted by neutron-capturing reaction of the light element of 6Li or 10B.
KATAGIRI MASAKI
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Shurin Sakurai