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the
were imply placed in upper vest pockets of the subject under test while gamma-
ray measurements were being made with the instrument standing close to the middle
of the back as already described. This arrangement leaves the ampoules 25 to
30 centimeters from the electroscope.
In order to ascertain the adaptability of different types of electroscopes
for measurements of this kind comparative experiments were condected by the pro-
cedure already described. Three instruments were tested: 1. The Wulf quartz
fiber electroscope, whose ionization chamber has a volume of 750 co; 2e a Schmidt
aluminum leaf electroscope with ionization chamber of 330 oc capacity; and 3. a
Lind interchangeable head attached to a large ionization chamber of 3 liter volume.
The experimental results are given in condensed form in Table II, in which the
first column shows the quantity of radium borne by the normally inactive subject.
The other columns give the correspondingly observed increases in drift of the
leaf or fiber, and drift per microgram, for each instrument, expressed in divi-
sions per second.
TABLE II. GAMMA-RAY MEASUREMENTS WITH DIFFERENT TYPES OF
ELECTROSCOPES.
Active source : Wulf Quartz Fiber
Schmidt
Lind
micrograms Ra
Drift increase Drift increase.Df Inc.
Dft Inc.
Dft. Inc. Dft.Inc.
x X 1õ²
X 1044
102
nerriga
X 10
X 10
x 104
meng
very
5
0.062
1.24
10
0.199
1.99
de
20
0.352
1.76
dale
0.172
1
0.86
:de
0.392
1.96
30
0.608
2.03
del
0.276
de
0.92
(0.445
(1.11
40
0.814
2.04
0.719
1.80
(0.448
1.120
A.B X10-3
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"ocrText": "-5-\nthe\nwere imply placed in upper vest pockets of the subject under test while gamma-\nray measurements were being made with the instrument standing close to the middle\nof the back as already described. This arrangement leaves the ampoules 25 to\n30 centimeters from the electroscope.\nIn order to ascertain the adaptability of different types of electroscopes\nfor measurements of this kind comparative experiments were condected by the pro-\ncedure already described. Three instruments were tested: 1. The Wulf quartz\nfiber electroscope, whose ionization chamber has a volume of 750 co; 2e a Schmidt\naluminum leaf electroscope with ionization chamber of 330 oc capacity; and 3. a\nLind interchangeable head attached to a large ionization chamber of 3 liter volume.\nThe experimental results are given in condensed form in Table II, in which the\nfirst column shows the quantity of radium borne by the normally inactive subject.\nThe other columns give the correspondingly observed increases in drift of the\nleaf or fiber, and drift per microgram, for each instrument, expressed in divi-\nsions per second.\nTABLE II. GAMMA-RAY MEASUREMENTS WITH DIFFERENT TYPES OF\nELECTROSCOPES.\nActive source : Wulf Quartz Fiber\nSchmidt\nLind\nmicrograms Ra\nDrift increase Drift increase.Df Inc.\nDft Inc.\nDft. Inc. Dft.Inc.\nx X 1õ²\nX 1044\n102\nnerriga\nX 10\nX 10\nx 104\nmeng\nvery\n5\n0.062\n1.24\n10\n0.199\n1.99\nde\n20\n0.352\n1.76\ndale\n0.172\n1\n0.86\n:de\n0.392\n1.96\n30\n0.608\n2.03\ndel\n0.276\nde\n0.92\n(0.445\n(1.11\n40\n0.814\n2.04\n0.719\n1.80\n(0.448\n1.120\nA.B X10-3"
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