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Comet assay to sense neutron 'fingerprint'
N Gajendiran1, K Tanaka, N Kamada
1Health and Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India. ngj@igcar.ernet.in
Mutation Research
|October 12, 2000
Summary
The comet assay effectively detects DNA damage from varying neutron energies in human lymphocytes. This method shows potential for neutron therapy and radiation exposure screening.
Area of Science:
- Radiobiology
- Radiation Physics
- Molecular Biology
Background:
- The comet assay is a sensitive technique for detecting DNA strand breaks.
- Neutron radiation is used in cancer therapy and poses risks from accidental exposure.
- Understanding neutron RBE is crucial for radiation protection and therapy.
Purpose of the Study:
- To evaluate the comet assay's suitability for identifying DNA damage induced by monoenergetic neutrons.
- To compare the DNA damage response of human lymphocytes to neutrons of varying energies and Cobalt-60 gamma rays.
- To determine the relative biological effectiveness (RBE) of neutrons using the comet assay.
Main Methods:
- Human peripheral blood lymphocytes were irradiated with monoenergetic neutrons (0.186-2.3 MeV) and (60)Co gamma rays.
- DNA damage was quantified using the alkaline comet assay, measuring tail moments.
- RBE values were calculated for different neutron energies.
Main Results:
- Neutron-irradiated cells showed longer comet tails with fragmented DNA compared to gamma-irradiated cells.
- Peak biological effectiveness of neutrons was observed at 0.37 and 0.57 MeV.
- RBE values varied with neutron energy, ranging from 1.7 to 6.3.
Conclusions:
- The alkaline comet assay is a useful tool for detecting neutron-induced DNA damage.
- The comet assay provides valuable data for neutron therapy applications and radiation accident dosimetry.
- Observed RBE values using the comet assay are discussed in comparison to other biological endpoints.