Table 1.

The average sizes of γ-H2AX foci expressed in BEAS-2B and SVEC4-10EHR1 cells due to alpha particle and X-ray exposures at doses of 0.05 to 1 Gy.

Cell	Dose (Gy)	Average size of foci (μm2)		Difference (%)	p value
		Alpha particles	X-rays
BEAS-2B	0.05	1.37(1) ± 0.45	1.11(2) ± 0.20	23.4(3)	0.62(4)
	0.1	1.31 $\pm$ 0.09	1.05 $\pm$ 0.11	24.8	0.12
	0.2	1.64 $\pm$ 0.12	1.13 $\pm$ 0.07	45.1	0.01
	0.35	1.56 $\pm$ 0.04	1.10 $\pm$ 0.06	41.8	0.03
	0.5	1.64 $\pm$ 0.10	1.15 $\pm$ 0.13	42.6	0.03
	0.75	1.57 $\pm$ 0.15	1.04 $\pm$ 0.05	51.0	0.06
	1	1.64 $\pm$ 0.12	1.12 $\pm$ 0.05	46.4	0.01
SVEC4-10EHR1	0.05	1.27 $\pm$ 0.04	1.07 $\pm$ 0.07	18.7	0.01
	0.1	1.73 $\pm$ 0.23	1.02 $\pm$ 0.06	69.6	0.05
	0.2	1.56 $\pm$ 0.06	1.07 $\pm$ 0.04	45.8	< 0.01
	0.35	1.56 $\pm$ 0.04	1.12 $\pm$ 0.02	39.3	< 0.01
	0.5	1.62 $\pm$ 0.09	1.12 $\pm$ 0.16	44.6	0.04
	0.75	1.50 $\pm$ 0.08	1.16 $\pm$ 0.07	29.3	0.03
	1	1.55 $\pm$ 0.09	1.00 $\pm$ 0.07	55.0	0.03

Percent difference (3) = {(1) − (2)}/(2) × 100.

p value (4) from two-tailed Student’s t-test with (1) and (2).