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RBE of 20 kV and 70 kV X-rays determined for survival of V 79 cells

1986; Elsevier BV; Volume: 7; Issue: 2 Linguagem: Inglês

10.1016/s0167-8140(86)80097-4

1879-0887

Matija Bistrović, Mirjana Bišćan, Tomislav Viculin,

Radiation Effects and Dosimetry

The survival curves of V 79 cells were compared for various types of sparsely ionizing radiation: 20 kV, 70 kV and 42 MV X-rays, 60Co γ-rays and 40 MeV electrons. A carefully calibrated thin window chamber was used for accurate dosimetry. The survival curves for cells exposed to 20 kV X-rays and 70 kV X-rays differed from that for 60Co γ-rays only by a dose-scaling factor t(RBE). RBE with respect to 60Co γ-rays could then be considered as dose-independent: 1.19±0.06 for 70 kV X-rays and 1.40±0.07 for 20 kV X-rays. RBE of 42 MV X-rays and 40 MeV electrons was not significantly different from 1.