TABLE 3.

Effect of using a Faraday cage with shielding during irradiation of cells on the direct and bystander effects.

Treatment	% control plating efficiency
Control	100 (23.5±1.6)
0.5 Gy Direct no shield	78.3±6.1*
0.5 Gy Direct shielded	97.2±6.7
0.5 Gy Direct shielded and in Faraday cage	98.0±5.4
Control bystander	100 (24.8±1.3)
0.5 Gy bystander no shield	60.7±4.4*
0.5 Gy Bystander shielded	63.1±4.1*
0.5 Gy Bystander shielded and in Faraday cage	75.6±4.3*

Flasks were irradiated to 0.5Gy see Fig 2 for set up design. Flasks were removed immediately from the cage and replaced in the incubator. Harvest of bystander medium took place lhr later. Data are presented as mean plating efficiency of directly irradiated cells or unexposed reporter cells receiving medium from irradiated donors. Significance values are between controls and treated groups.

^*= p<0.05