Information on stopping power(s.p) is essential in many fields involving
radiation. Their accuracy may critically affect calculations, measurements and
interpretation of experiments. Research concerning the stopping power has taken the
position of the basic theme in the fields of ion-matter interactions for a long time.
Despite the long history of stopping power research, the current knowledge, both
experiment and theoretical, is far from being complete, and is often inadequate for the
determination of stopping power values of a variety of materials and for a wide range
of particle energies( Sing 2013) . The study of s.p. to positron and electron through
matter is an effective tool for exploring the structure of matter s.p. in materials are of
interest in many research fields, such as in nuclear physics, atomic physics, solid-state
physics, radiation dosimetry and nuclear technique applications. During the last two
decades, it has attracted a great deal of attention. The s.p. calculations for ?+are
studied in two different ways : the first is to consider the interactions of incoming of
the positron with target electron , which is called collisional s.p. which may end with
annihilation radiation if the conditions are met, while the second is considered the
fact that decelerated charged particles as approach nuclear field ,which is called
radiative s.p. Or Bremsstrahlung Loss which will discussed in the next section in
details. The total stopping power is given as follows (Pal 1986 , Bethe 1932) :