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The aim of this thesis is to study effects of absorbers on perturbed angular correlation spectrum and present the results as well. This thesis will provide a reference to future work on perturbed angular correlation spectrum. A hafnium sample made radioactive by neutron irradiation has been used in this research and it is my hope that it will provide a good reference for future work. The results showed that there is a sizeable effects on angular correlation spectrum when a material is placed between the sample and the source. However, the electric field gradient parameters are not affected by the absorbers. The A2 values decreased with increasing thickness of the absorber and with an off-set absorber position. A2 also decreases with increasing width of the single channel windows.