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Keywords:

  • biosensors;
  • deoxyguanosine;
  • DNA structures;
  • γ radiation;
  • liquid crystals

The pitch of the columnar cholesteric mesophase formed by the dinucleoside phosphate d(GpG) and water becomes shorter after exposure to γ radiation. This effect can be measured directly with an optical microscope from the distance between the fingerprint lines. The inverse pitch is linearly correlated to the dose absorbed between 0 and 20 kGy.