Tenth lecture

Last lecture Radiation Units Shortly after the discovery of xrays in 1885 by Professor Roentgen scientists began to notice the harmful effects of exposure to this radiation There were many years before people realized how dangerous xrays and other radiation could be Quite number of pioneer radiologists suffered severe injuries and some even died as a result of prolonged exposure to dangerously high intensities of Xrays These early workers in the field had no means of measuring the harm caused by radiation accurately and depended on unreliable effects such as the degree of skin reddening caused by the exposure or on timing the exposure from a certain type of Xray machine to establish

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