[18p-P05-1~30] 2 Ionizing Radiation(Poster)

[18p-P05-6] Scintillation Properties of Nd, M-codoped BaF₂ (M = Er, Tm, Y, and Lu) in the VUV Region

〇Noriaki Kawaguchi¹, Daisuke Nakauchi¹, Takumi Kato¹, Takayuki Yanagida¹ (1.NAIST)

Keywords:scintillator, VUV, fluoride

The proportional counter is excellent in that it is easy to manufacture a large-area and inexpensive radiation detector, but low detection efficiency is a problem for gamma-ray detection. As a means to solve this, from the latter half of the 1980s to the 1990s, a proportional counter filled with an organic gas such as tetrakis (dimethyl-amino) ethylene (TMAE) having sensitivity to vacuum ultraviolet (VUV) light, and a proportional counter in the VUV region. A detector combined with a scintillator (VUV scintillator) that emits light at a wavelength has been proposed. However, while Nd-doped LaF₃, which was studied as a favorite of VUV scintillators at that time, has an extremely short scintillation attenuation decay time derived from the 5d-4f transition of Nd³⁺, its light yield is significantly low compared with visible light scintillators such as BGO and NaI:Tl. Therefore, such a detector has not yet been put into practical use, and a basic study for improving the light yield has been required. In this presentation, we report the results of comparing the VUV emission intensities of Nd-doped BaF₂ samples co-adoped with Er, Tm, Y, and Lu.