. The American journal of roentgenology, radium therapy and nuclear medicine . diation is of great importancefor radiography, for the radioscopic method,for the use of the radiation in depththerapy, for the measurement of theeffective tension and for judging the workdone by the apparatus and roentgen Utilization in Radiography. Experi-ence has pro\ed that each radiogram needscertain conditions of exposure in order toattain its best quality. These conditions of finally to get a perfect system of exposurefor his apparatus. Now the testing- of theapparatus has become much simpler,becau
. The American journal of roentgenology, radium therapy and nuclear medicine . diation is of great importancefor radiography, for the radioscopic method,for the use of the radiation in depththerapy, for the measurement of theeffective tension and for judging the workdone by the apparatus and roentgen Utilization in Radiography. Experi-ence has pro\ed that each radiogram needscertain conditions of exposure in order toattain its best quality. These conditions of finally to get a perfect system of exposurefor his apparatus. Now the testing- of theapparatus has become much simpler,because with the aid of such a system ofexposure empirically worked out, we couldfind out qualimetrically (by giving theboundary wave-length, X^) and quanti-metrically^ (by giving the necessary milli-ampere second product) the conditions ofexposure for all practicable adjustmentsin use. The new process of testing an apparatusis now accomplished in a much simplerway without the help of the empiricalmethod; the radiations of the apparatuswith the different settings are anahzed one. Fig. 4. exposure are different for e\ery thicknessof the object and density of a part of thehuman body which is to be they are not obserxed the well-knownpoorly exposed plates result which we knowas the too hard and too soft plates(mistakes of penetration or hardness) andthe plates with too little or excessiveblackening (under-exposure, over-expo-sure). Up to now the practitioner had tohelp himself with an empiric method toget the right values of exposure for alltypical and atypical radiograms, becausethere was no sufficiently exact method ofassuring the quality of a radiation. Thepractitioner had to create for himself byway of empiricism, a system of exposurewith the help of a systematic procedure,for the apparatus he used; he had to makeexperimental exposures and, by slowlyeliminating the errors in exposure, to tryto obtain better and better plates and
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