Abstand zw. exponiertem Objekt und Expositionsquelle
The warm room accommodated up to 10 radial transmission lines (RTLs), the culture medium in which was maintained at 37.0 ± 0.3°C. The RTL consisted of a parallel-plate region formed by an aluminium bottom plate and a hinged lightweight metal-faced composite top plate and terminated radially by MW-absorbing layers backed by a lamina of perforated aluminium [Moros et al., 1999].
Each RTL could hold 16 T-75 flasks each containing 40 ml of medium (1200 cm² of culture area in total) at a radius of 292 mm from the central conical antenna. The electric field of the waves propagating radially outward was perpendicular to the cell layer. The tangential magnetic field was perpendicular to the EF and the propagation direction.
Positive controls were irradiated at melting ice temperature with low doses of 137Cs γ-rays at a dose rate of 6.55 cGy/min. In addition, every MW exposure experiment included a sample that was irradiated with 2 Gy of γ-rays at a dose rate of 1.1 Gy/min.
Mess- und Berechnungsdetails
The RTLs were extensively characterised, and complete fine mapping of the SAR was done using a bowman probe at 18 points in over 64 individual measurements. SARs at the bottom of the flasks were determined using a fast temperature differential measurement technique [Pickard et al., 1999].
Moros EG et al.
The radial transmission line as a broad-band shielded exposure system for microwave irradiation of large numbers of culture flasks.
Pickard WF et al.
Simplified model and measurement of specific absorption rate distribution in a culture flask within a transverse electromagnetic mode exposure system.