52 Scientific Proceedings, Royal Dublin Society. 



Table 5. 

 Skin action with various iiat and tubular brass applicators. 



t = Thickness in mm. 



D = External diameter of tubular applicator of wall-thickness f, allowing an 

 internal diameter of 1 mm, to hold a single central emanation tube. 



F = Eelative activity tlirough t. mm. at any fi.ved distance. 



A,i = Skin action per mc. hr. for single emanation tube in tubular applicator of 

 thickness t and diameter D, or in contact with a flat applicator of tliiek- 

 ness t. This also represents the maximum skin action for a single tube 

 in a larger tubular applicator, in which the tube rests against one side. 



A„ = Skin action for applicator thickness t, external diam. 3 mm., completely filled 



