Lymphocytes from healthy donors were exposed to 2.45 GHz (A) or 8.2 GHz (B) for 2 hours. Mean SAR was 2.13 W/kg and 20.71 W/kg, and temperature was maintained at 36.9 and 37.5 °C for (A) and (B) respectively. Other cells were sham-exposed to RFR, or exposed to 1.5 Gy gamma radiation. The lymphocytes were examined to determine the extent of cytogenetic damage, assessed from the incidence of chromosomal aberrations and micronuclei.

The levels of damage in RFR-exposed and sham-exposed lymphocytes were not significantly different. Also there were no significant differences in the response of unstimulated lymphocytes and lymphocytes stimulated with phytohemagglutanin when exposed to 8.2 GHz radiation. The positive control cells subjected to gamma radiation, however, showed significantly more damage than RFR- and sham-exposed lymphocytes.