  The energy loss behaviour of fission fragments (FF) from $^{252}$Cf(sf) in
thin Mylar ($H_8 C_{10} O_4$) and Aluminium absorber foils have been revisited.
The aim is to investigate the observed change in the well known asymmetric
energy of spontaneous fission of $^{252}$Cf as the fragments pass through
increasingly thick absorber foils. Two different types of absorbers have been
used: one elemental and the other an organic compound. The stopping powers have
been determined as a function of energy for three fragment mass groups with
average masses with $<A>$ = 106.5, 141.8, 125.8 corresponding to light, heavy
and symmetric fragment of $^{252}$Cf. Using the effective charge (Z$_{eff}$) in
the stopping power relation in the classical Bohr theory best describes the
stopping power data. Spectrum shape parameters, subsequently have been
extracted from the energy spectra of fission fragments for different foil
thickness. The effective charge (Z$_{eff}$) correction term determined from the
stopping power data is then used in the simulation for the absorber thickness
dependence of the shape parameters of the energy spectrum. The present
simulation results are compared with the TRIM prediction. The trends of the
absorber thickness dependence of the spectrum shape parameters, for both Mylar
and Aluminium are well reproduced with the present simulation.
