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Flinn report, page 2.
determined, for the quartz fibre to pass over the same divisions
as used in ascertaining the natural drift. It is obvious that
any change in the rate of movement of the fibre must be ascribed
to a change brought about by the ionization of the air within the
chamber, due to the presence of radioactive substances.
The natural dbift of the fibre over 10 divisions in the cases
listed below required 209 seconds.
Specimen 14, test tube, w1 th material introduced required 198 sec.
Specimen 18,
11
11
11
13
"
"
.
195
n
Specimen 24,
"
"
11
11
"
n
202
"
Specimen 630,
11
"
11
"
a
203
11
11
"
Specimen K,
11
n
"
11
11
148
Specimen n,
"
11
n
11
11
"
197
"
Specimen W, brown bottle, 11
"
"
"
147.5
11
Speciman Marrow, test tube,
11
"
"
193
"
When we consider that speciman B, which contains 0.23 nicro grams
of radium element per gram causes the fibre to nove over 10
divisions in 3 to 4 seconds we can realize that the quantity of
radium must be small in the above cases. I have made calculations
of the approximate quantity of radium alement or its equivalent
contained in the list of samples. It must be born in mind that
the values reprevent approximations only.
Specimen 14 contains the order of 5.0 x 10-4
nicro B ra el per 5.
11
18
"
"
11
11
4.6 X 10-4
11
is ra el per 5.
11
24
11
It
11
220 x 10-4
"
8 ra el per g.
11
630
11
11
11
11
2.0 X 10-4
11
to ra el per 8.
11
K
11
n
11
"
2.5 x 10-3
11
6 ra el per 8.
"
R
11
"
11
11
2.5 x 10-4
it
B ra 93 per 6.
"
W
"
a
11
"
1.6 X 10-3
11
8 C& 91 per B.
11
18
a
"
"
5.0 X 10-4
18
marrow
ra el per E.
I should By that in all oases except K and W, where quite a
definite effect 18 recorded, the reaction is feeble. However,
there is no question but what we are justified in coming to the
conclusion that in all cas B the material is active. It may be
of interest to know that many igneous and sedimentary
rocks cont in around 4 X 10-5 micro grans of radium element per
gram.
Considering the condition in which the speciuens of urine were
received it was somewhat difficult to make very nocurate radium
mensurements. However, the specimens were 3ll decidedly active.
Their content was of the order of 2.5 X 10" micrograns of c adium
element per scan. Specimen No.2 was the nost active and specimen
No. 3 the least with No 1 falling intermediary.
H. H. Barker.
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"ocrText": "Flinn report, page 2.\ndetermined, for the quartz fibre to pass over the same divisions\nas used in ascertaining the natural drift. It is obvious that\nany change in the rate of movement of the fibre must be ascribed\nto a change brought about by the ionization of the air within the\nchamber, due to the presence of radioactive substances.\nThe natural dbift of the fibre over 10 divisions in the cases\nlisted below required 209 seconds.\nSpecimen 14, test tube, w1 th material introduced required 198 sec.\nSpecimen 18,\n11\n11\n11\n13\n\"\n\"\n.\n195\nn\nSpecimen 24,\n\"\n\"\n11\n11\n\"\nn\n202\n\"\nSpecimen 630,\n11\n\"\n11\n\"\na\n203\n11\n11\n\"\nSpecimen K,\n11\nn\n\"\n11\n11\n148\nSpecimen n,\n\"\n11\nn\n11\n11\n\"\n197\n\"\nSpecimen W, brown bottle, 11\n\"\n\"\n\"\n147.5\n11\nSpeciman Marrow, test tube,\n11\n\"\n\"\n193\n\"\nWhen we consider that speciman B, which contains 0.23 nicro grams\nof radium element per gram causes the fibre to nove over 10\ndivisions in 3 to 4 seconds we can realize that the quantity of\nradium must be small in the above cases. I have made calculations\nof the approximate quantity of radium alement or its equivalent\ncontained in the list of samples. It must be born in mind that\nthe values reprevent approximations only.\nSpecimen 14 contains the order of 5.0 x 10-4\nnicro B ra el per 5.\n11\n18\n\"\n\"\n11\n11\n4.6 X 10-4\n11\nis ra el per 5.\n11\n24\n11\nIt\n11\n220 x 10-4\n\"\n8 ra el per g.\n11\n630\n11\n11\n11\n11\n2.0 X 10-4\n11\nto ra el per 8.\n11\nK\n11\nn\n11\n\"\n2.5 x 10-3\n11\n6 ra el per 8.\n\"\nR\n11\n\"\n11\n11\n2.5 x 10-4\nit\nB ra 93 per 6.\n\"\nW\n\"\na\n11\n\"\n1.6 X 10-3\n11\n8 C& 91 per B.\n11\n18\na\n\"\n\"\n5.0 X 10-4\n18\nmarrow\nra el per E.\nI should By that in all oases except K and W, where quite a\ndefinite effect 18 recorded, the reaction is feeble. However,\nthere is no question but what we are justified in coming to the\nconclusion that in all cas B the material is active. It may be\nof interest to know that many igneous and sedimentary\nrocks cont in around 4 X 10-5 micro grans of radium element per\ngram.\nConsidering the condition in which the speciuens of urine were\nreceived it was somewhat difficult to make very nocurate radium\nmensurements. However, the specimens were 3ll decidedly active.\nTheir content was of the order of 2.5 X 10\" micrograns of c adium\nelement per scan. Specimen No.2 was the nost active and specimen\nNo. 3 the least with No 1 falling intermediary.\nH. H. Barker."
}