Table 2.
Cytogenetic data from bone marrow cells collected at 4 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. t Translocation (incomplete chromatid-type), RT Robertsonian translocation, dic Dicentric, ins Insertion, nP Non-painted chromosome.
| 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-chromatid | Chromosome | exchanges | |||||||
| scored | cells | breaks | (1) | (2) | (3) | (nP) | breaks | (1) | (2) | (3) | (nP) | |||
| 0 | 1,056 | 38 | 28 | 5 | 2 | 1 | 20 | 20 | 8 | 1 | 1 | 9 | 7 | t(nP;1),t(nP;2),t(nP;1),t(nP;1), ins(1;nP;1),ins(3;1) two cells |
| 0.05 | 383 | 19 | 18 | 3 | 2 | 1 | 12 | 8 | 1 | 1 | 0 | 6 | 1 | t(nP;1) |
| 0.10 | 935 | 125 | 81 | 11 | 5 | 7 | 58 | 48 | 17 | 4 | 7 | 20 | 11 | t(1;3),t(nP;3),t(nP;1),t(nP;3), ring(nP), dic(nP;nP), dic(nP;nP),dic (nP;nP), ins(nP;1;nP),RT(1;2),RT(nP;nP) |
| 1.00 | 256 | 137 | 242 | 25 | 11 | 13 | 193 | 73 | 16 | 8 | 11 | 38 | 14 | t(2;1),t(nP;1),t(nP;2),t(nP;2),t(nP;2),recip-t(nP;nP),t(3;1) , t(nP;1),t(nP;2),t(nP;3), ins(nP;2;nP),ins(nP;3;nP), ins(nP;3;nP),RT(nP;nP) |