the Fluorescent Rant gen Radiations. 

 Table. 



407 



Radiator. 



H-Mi 



Al 



S 



Ca 



Cr 



Fe 

 Co 

 Ni 



Cu 



Zn 



As 



Se 



Br 



Eb 



Sr 



Mo 



Rh 



Ag 



Sa 



Sb 



I 



Ba 



Ce 



W 



Pt 



Au 



Pb 



Bi 



Atomic 

 Weight. 



1-008 -24-32 



271 

 3207 



40-09 



52 



55-85 



58-97 



58-68 

 (Gl-3) 



63-57 



65-37 



74-96 



79-2 



7992 



85-45 



87-62 



96-0 

 102-9 

 107-88 

 1190 

 1202 

 126 92 

 13737 

 140-25 

 184-0 

 195-0 

 197-2 

 207-1 

 208 



Absorbability of Fluorescent 

 Badiation (- in Alj. 



Series K. 



Series L. 



435 



136 



88-5 



71-6 



591 



477 



39-4 



22-5 



18-9 



164 



13-7 



9-4 



4-7 



31 



2-5 



1-57 



1-21 



700 



435 

 306 

 224 



33 



27-. 

 25 

 20 

 19 



Kemarks. 



No radiation observed : probably 

 very absorbable. 

 | Effects of fluorescent radiation ob- 

 J served: measurements not made. 



Not so accurate as values below. 



) Easily observed and homogeneity 

 proved with considerable accu- 

 racy. 



For atomic weight of Ni see paper 

 bv Barkla & Sadler (Phil. Mag. 

 Sept. 1907). 



Not accurately determined for Kb. 



j Owing to two fluorescent radia- 

 I tions total radiation appears very 

 I variable in experiments with 

 )- primary radiation of ordinary 

 penetrating power. 

 Series L not obtained with accu- 

 racy of series K. 



| Homogeneity not shown with ac- 

 curacy, consequei.tly values of 



i absorbability only approximate, 

 — possibly rather high. 



Note. — Radiations from Cr, Fe, Co, Ni, Cu, Zn, As, Se, Ag were obtained 

 bv Barkla and Sadler (Phil. Mag. May 1909) ; from Mo and Rh by Sadler 

 (Phil. Mag. March 1910); from Ca, Sb, I, Ba Ag L by Barkla and Nicol 

 (' Nature,' Aug. 4, 1910) ; from Br by Chapman. 



2 Fu 2 



