The gross alpha and beta counting equipment used in
this work is MPC-2000, a Low Background alpha and
beta counter. The equipment is a gasless proportional
counter with ultra-thin window. The sample was placed in
a planchet and later placed in a sample carrier. The carrier
was then placed on the sample drawer and closed for the
purpose of gross alpha and beta counting. The counting
was done automatically according to the selected count
mode when the appropriate sample parameters were
entered . The second equipment used for determination
of some trace heavy metals is Atomic Absorption
spectroscopy (AAS).