Are the Formulae for the Absorption of High Energy Radiations Valid?

be a distinct systematic difference between the separations depending on the pressure used in the source. It is conceivable that this is real. On the other hand it may be due to wide variation in intensities of the, unresolved components. If we assume that the fourth and fifth components have zero intensities on the low pressure plates and theoretical intensities on the high pressure plates, the systematic difference is greatly reduced. The only conclusion to be drawn at present from this difI'erence is that the uncertainty of the separation must be much greater than is indicated by the calculated probable errors, Our best estimate of this uncertainty may be expressed by saying that 1/n probably lies between 137 and 138.