The present invention provides radioprotective materials and products produced
using the materials, the materials and products being easily usable for blocking
effects of radiations, exposure to which occurs unconsciously in daily life or
in a working environment. Specifically stated, the present invention provides radioprotective
materials containing polyamino acid(s) or derivative(s) thereof; the radioprotective
materials in which the polyamino acid(s) comprises at least one amino acid selected
from the group consisting of glutamic acid, phenylalanine, alanine and leucine;
and the radioprotective materials in which the polyamino acid(s) or derivative(s)
thereof is modified with sugar component(s). The present invention further provides
radioprotective products produced using the radioprotective materials.