INDEX
493
Preparation of (Conf.)
Pumps:
_
._
.
-
_
_
—
ionization chambers, 410, 419
—
fore, 354
'
'—
quartz bers, 385
—
high vacuum, 356
,
'
—
radio-active substances, 253, 258
—oil, 360
.
—
——
shallow chambers, 419
——
speed, 354
——
thin lms, 64
Purifying gases,
377
'
—
thorium active deposit, 254
Pyrex to tungsten, seal, 375
'
——
tungsten-pyrex seals, 375
Pyrometer, optical,
112
'
—
Wax, for vacuum, 372
‘
'
-
,
ÎCIÏËaÏdrement of, 3 64
_
Quadrant
electrometers: 396
_
_
—reduction of, see vacuum;
_
adjustment,
415
__
units 364
.
-—
connections, 397
‘
_
.
’
——
current calibration, 402
_
_
-
Pr1m ary beta r ay spectra,
274
—current measurement 179 398
Principle of uncertainty, 61
__
types,
404
'
,
’
'.
Probability:
——
voltage calibration, 416
'
__
-
——
of atomic excitation, 150
Quantity, electrical:
'
_
.
_
«
'“
Of ionization, 148
-—
measurement of 404
_
_
——
of transmutation, 325
Quantum:
_
_
_
_
Probes: 166-172
_
-—
counters, 424
_,
_
——
cold, 166
—
eqxiivalence,_79,
85
.
_
"
'
‘
—
current to, 167, 171
-——
_
_
…
.
-—exper.,
185
_
Quantumtheory:
77 -
__
'
_,
_
'
'
_
——
Heating, 166
_
-—
in atomic radiation, 150
'
_,
'
——
hot lament, 166
-—
effect, 203
,
'
_
_
_
sheaths, 166, 167
——
in photo-electric effect,78
_
_
.
_
Problems, 450
Quartz, bers, 385
__
,
;
-
;"
-_'
Production of electron pairs, 330 _
.'
..
Proportioml counters, 424
,
Radiation;
;
“
'
'
'
Protection:
'
'
"
'
"
'
'
‘" alpha ray,260—274 "'
"
'
"
'
_
'
'
__
from neutrons,3_30
—
»_
,
-—
and quantum theorv,__77,:l50,
-
_
__
—
from X—ŒYS,
199
'
V
‘
'
"
“"
beta ray, 274—283 """
-
'
'
Proton:
'
'
'
"
'
'
‘
'
'
”_,
"
'
'
'
-—
absor tion curve 312
m‘
’
'
…
-
'
"
—chargî, mass, sel'f eh'ergÿ; l'iàCk
""
gammarav,277‘283:314:330:
‘
-——
counter tubes for, 424
"
-—gauge,368
_
'
_
-'
—
.
——
drop-tracks of, 439
-—ofhght,lso
_'
,
—ejected,
311
L“—
…
'
'
-
'
-—
groups from
a
—
—Ï èîmP1è'_
.
;