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OCR Page 1 of 2Sample of Bone Cortex and Marrow Taken from
The Femurs of Mrs Mallifer.
These samples were handed to Mr. Viedt and
myself by Dr. Martland shortly after
November 1, 1925.
The total gamma rayactivity was measured on a sample contanning
weighing 60.2 grains and expressed in terms of radium equivalent.
The actual radium present was determined by the emanation method.
Gamma ray measurements of the tube containing 60.2 grams.
11/13
0018 mst
12/4
0010
11/16
0021 IT
12/9
0011
11/18
0014 1f
12/14
0020
11/20
0015 "
12/18
0014
average of .0015 mg. or 2.5 X 10-5 mg per gram.
Assuming the total weight of the bone in the body to be 13/16
of that in Leman's body (9800 grams) and that this sample is
representative of the total, we calculate the total quantity
of radium equivalent contained in the body to be 199 micrograms.
The emanation values determined were as follows:
7.45
X
10-°
m8.
per
gram.
7.50
11
11
"
11
7.58
ff
11
"
11
7.61
"
11
11
11
7.50
11
11
!1
11
7.55
"
"
"
11
average.
13/16 X 9800 X 7.55 X 10-6 gives 60 micragrams of radium element
It thus appears that about 30 percent of the totad activity can
be ascribed to radium while the balance or 70 percent must be
ascribed to mesothorium or radiothorium.
H. H. Barker.
Physical Laboratory,
U. S. Radium Corporation,
December 18, 1925.
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