IBSTRACT. The increased x-ray dose to soft tissue adjacent to plane bone interfaces v x s measured as a function of x-ray quality and depth. The measurements were pwfonned using a thin pol>-ethj-lene-film dosemeter. Experimental data are presented for tl variety of clinically useful x -r a y qualities. Comparison of the results with calculated doses assuming monoenergetic photons jhox-s discrepancies which are attributed to the x-ray spectra. It is shown that 1%-hen the x-ray spectra are broad and of low quality (lorn kvp and low filtration) differences between the measured and calculated values are great.

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In discharge denitrification, radical production by electron collision with combustion gas is a key process which determines the denitrification process and its performance. In this study N, O, OH and H radical densities have been measured by appearance mass spectrometry in a low-pressure discharge field with parallel electrodes (2 cm gap) under simulated combustion gas flow. Also, electric field, electron number density and electron temperature at the radical sampling position have been measured by the Langmuir probe method. Under constant discharge pressure the radical density (cm −3 ) was about 10 11 -10 12 cm −3 , and the density increased with increasing the discharge current. Under constant discharge current, both the radical concentration [−] and electron temperature increased with decreasing pressure. The radical concentration in the cathode fall region was greater than that for the outer region. Additionally, we measured the concentration change of NO mixed in the simulated combustion gas and observed a little change of the NO concentration.

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