Table 4.

Average square root transformation values (√X + √(X+1)) of mean aberrations in 100 cells scored ± standard error of the mean (S.E.) derived from the raw data of the frequencies of each type of aberration, including abnormal cells as shown in Table 2 (4 h post-irradiation).

Dose (Gy)	Total number of abnormal cells ± S.E.	Total number of chromatid breaks ± S.E.	Total number of iso-chromatid breaks ± S.E.	Total number of exchanges ± S.E.
0	2.73 ± 0.25	2.44 ± 0.28	1.87 ± 0.15	1.07 ± 0.20
0.05	5.21 ± 1.05	4.99 ± 1.10	3.61 ± 0.73	1.73 ± 0.46
0.10	6.05 ± 0.79	4.73 ± 0.83	3.67 ± 0.59	1.52 ± 0.28
1.00	19.53 ± 2.03	26.40 ± 3.48	13.62 ± 1.69	7.02 ± 1.20