Tsoulou, E., Kalfas, C. A. and Sideris E. G. Probing Irradiated DNA with the Perturbed Angular Correlation Method. Radiat. Res. 156, 181–185 (2001).
The technique of perturbed angular correlations of γ rays has been used to study the effects of radiation on DNA molecules. The samples are buffered solutions of calf thymus DNA exposed to various doses (0–80 Gy) of γ rays. Indium-111 is used as a probe. Rotational correlation times, τc, a parameter measuring the flexibility of a macromolecule, are obtained that show a dependence on radiation dose.