342 
PROF. C. G. BARKLA ON X-RAYS AND THE THEORY OF RADIATION. 
K fluorescent radiation (energy) K corpuscular radiation (energy) 
K primary absorption (energy) 5 K primary absorption (energy) 
Total K secondary radiation (energy) 
K absorption (energy) 
in columns II., IV. and VI. along with the simple theoretical values for the first two 
— —and ——— in columns III. and V. The agreement between the values in 
n + n K n + n K 
columns II., IV. and VI. with those in columns III., V., and with unity respectively, 
is certainly sufficiently close to permit us to say that these simple energy relations 
express the experimental facts exceedingly well for a first approximation. It should 
be observed that the recorded values are not simply relative values; each one is the 
result of an absolute determination in the sense that it is independent of the others, 
and might have had any value less than unity. There appears to be little loss of 
energy within the atom, but what there is appears most marked when fx is just less 
than a K . The values of ——— and ——— are plotted against wave-lengths of primary 
n + n K n+n K 1 s B r J 
radiation in fig. 5 where they are indicated by the broken curves. 
Table VI. 
I. 
+3 
blj 
OJ 
> 
cS 
«5 
hh 
X 
O 
pH 
cm. 
0-87 x 10~ 8 
0-71xlO- 8 
0-56 x 1CT 8 
0-49 xlO" 8 
0-35 x10 _s 
II. 
cjj 
u 
CD 
Tj 
a 
a 
S—i 
o 
CE 
M 
bJO 
s 
55 
o 
'P 
p t 
o 
m 
' o 
ct 
>> 
•P 
Ph 
M 
0*42 
0*36 
0*31 
0*29 
0*23 
III. 
46 
41 
35 
32 
26 
IV. 
^5 
f-i 
<x> 
Q-, 
o 
o 
bX) 
S 
a> 
%-* 
0-46 
0-55 
0-66 
0-75 
0-76 
Y. 
+ 
VI. 
bJD 
t-* 
<D 
PU 
S- 
O 
o 
+ 
-J-2 
s 
o 
WJ 
<D 
S-< 
o 
p 
pp 
M 
^5 
fH 
o 
?-< 
o 
m 
o 
Cv 
h> 
S 
2 
1 H 
f-t 
0 
54 
0 
88 
0 
59 
0 
91 
0 
65 
0 
97 
0 
68 
1 
04 
0 
74 
0 
99 
