Mechanical changes of bone caused by X-ray radiation of low doses

We investigated the micromechanical properties using doses from 1 up to 7 G ray and could observe a roughening on the surface of the bone material in t he microscopic range by scanning acoustic microscopic measurements. In addi tion, a preceding irradiation promoted an extension of microcracks during t he polishing process indicating an embrittlement. After irradiation and rem oval of the surface layer the SAM measurements indicate a preferential incr easing of hardness of softer regions. These results are consistent with our measurements by environmental scanning electron microscopy.