The values are presented in Fig. 8. The average
value is 0.90 ± 0.39% (range 0.12e1.88). As it is shown in Fig. 8, there
is scattering of values, but the majority is concentrated between 0.4
and 1.2%. It is important to mention that these figures are rough
approximations and are not based on actual measurements, with
exceptions, as in the cases of Canada and Greece, where the percentage
of HHW has been estimated based on sampling in a
municipal landfill