Proceedings of the National Academy of Sciences · 1930 · 52 citations · 0 references
MedicineNuclear EngineeringRadiation DosimetryRadiation MeasurementRadiation PhysicsAbsorbed DoseGamma-ray InstrumentationCurrent MeasurementHomogeneity Criterion
The relation between the frequency of hard radiations and the absorption coefficient is not experimentally well established at the present time. In order to obtain definite information it is necessary to use a radiation with high homogeneity. γ-Rays from ThC” are found to fulfill this requirement. Investigations of the absorption coefficient of these rays have been made by Russell and Soddy,(1) and Rutherford and Richardson,(2) almost 20 years ago before the modem technique of sensitive current measurement was developed.