Table 1.
Cytogenetic data from bone marrow cells collected at 1 h after exposure of male SCID/J mice to varying low doses of 137Cs γ rays, including a high dose of 1.0 Gy serving as a reference dose. All aberrations are chromatid-types.
| Total | Total | Total | Chromatid breaks | Total | Iso-chromatid breaks | Total | Exchanges | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dose | number of | number of | number of | (Chromosome involved) | number of | (Chromosome involved) | number of | |||||||
| (Gy) | cells | abnormal | chromatid | Chromosome | Iso-chormatid | Chromosome | exchanges | |||||||
| scored | cells | breaks | (1) | (2) | (3) | (nP) | breaks | (1) | (2) | (3) | (nP) | |||
| 0 | 1,078 | 44 | 34 | 2 | 3 | 1 | 28 | 13 | 3 | 2 | 2 | 6 | 5 | t(nP;1),t(nP;1),t(nP;nP),t(nP;3), ins(nP;1;nP) |
| 0.05 | 483 | 37 | 39 | 3 | 4 | 0 | 49 | 27 | 6 | 9 | 5 | 7 | 3 | recipt (nP;3),t(np:1); t(nP;1) |
| 0.10 | 908 | 110 | 133 | 14 | 8 | 6 | 95 | 53 | 14 | 8 | 9 | 22 | 8 | t(nP;1),t(nP;3),t(2;nP),t(nP;1), t(nP;2),t(nP;3),dic(3;nP), dic(nP;nP) |
| 1.00 | 513 | 311 | 475 | 35 | 22 | 30 | 388 | 62 | 13 | 10 | 15 | 24 | 18 | t(1;2) two cells,t(2;3),t(nP;1)t(nP;1), t(3;2) two cells,t(3;nP), recip t(3;nP), t(nP;1),t(nP;1),t(nP;1),t(nP;2), t(nP;2),t(nP;3),t(nP;3),t(nP;3), dic(nP;nP) |
t Translocation (incomplete type), recip t Reciprocal translocation, dic Dicentric, ins Insertion, nP Non-painted Chromosome.