High intensity of the luminescence of
trivalent terbium ion in the visible region, and in particular, in
the “green” area of λ ¼543 nm, makes it suitable for silicon based
detectors. Therefore, the Tb 3þ ion is as a dopant for crystals and
glasses which are used to detect ionizing radiation. In [6] applica-
tion of fiberglass with Tb 3þ in real-time radiography is described.