A typical group II–IV compounds is promising
materials for producing phosphors because of their wide
band gap . Nanocrystalline ZnS crystals are known to
have different characteristics such as photoluminescence
and thermoluminescence properties as compared with
bulk materials . Commonly used thermoluminescence
dosimeter (TLD) materials such as LiF:Mg,Ti (TLD-100)
is either suitable to measure low dose or high dose only.
Most TLD materials suffer from severe sup linearity at
high doses reducing the choice of TLD materials for high
dose application such as megavolt therapy. So we are
trying to look for materials which are highly sensitive so
as to be able to measure low dose and also shows linear
response to radiation dose from very low up to extremely
high dose (Mrad region).