456
PROBLEMS
10—6. Assume that an alpha particle‘is composed of two neutrons and
two protons.
Compute the binding energy
of the alpha particle.
11—1. Dene the millicurie of radon and of polonium. ,What is the
mass of one millicurie of polonium?
(0.0272 g.)
11—2. What is the saturation current produced in a ionizatioñ chamber
by 1 millicurie of polonium if all the alpha particles are completely
absorbed?
(1400 e.s.u. = 4.6 X 10“7 amp.)
11—3. The half—life period of thorium is 1.8 X 1010 years. What is
its transformation constant and average
life?
1-1—4. How many days after uranium Xl has been isolated before 90
per cent has changed to uranium X2? The half period of uranium Xl
is 24 5 days.
11—5. The transformation constant for radium is 1.35 X 10”11 per
second and its atomic weight is 226. The atomic weight of uranium I
is 238.
There are 3.44 X 10_7 gram of radium in equilibrium With each
.gram
of uranium I.
Calculate the half period
of uranium 1 in years.
11—6. One gram of radium emits 3.71 X 1010 alpha particles per sec—
ond. The transformation constant of radium emanation is 2.097 X 10“6
atom per second and its density is 0.00987 gr. per cc.
The number of
atoms per cc. of a monatomic gas is 2.705 X 10”.
Calculate the volume
,
and mass of one curie.
11—7. There are 13.6 ><‘1010 alpha particles emitted each second by
one gram of radium in equilibrium with its decay products. Calculate
the volume of helium produced by one gram of radium and its products
.
in one year.
"
(159 mm.3)
11—8. The number of alpha particles emitted per gram of radium each
_
'
Second is"3.71 ><
*If the atomic weight of radium is 226, what is its
«
half periodin years? One year = 3.156 >< 107 sec.
‘
'
‘
‘
Üranium 1 is freed from all;its
placedin a beta-ray
electroscope. HOW many days before the rate of fall of the leaf of the
_
" électros“copfe7 reaches“50% of "its maximum value?t The transformation
,
'“
X:is 3.275 >< 10“7.
'
‘
-.
:«;i:
…
personhas
radium today,
will he —
.
hfherdf10y Take thehalf—.1îfeof-radîùm 159Oy
;ÏLJ
11—11
:rst'
'
and:
determine
t1me necesSaryto reach %
;:eqùilibfiui
PROBLEMS
10—6. Assume that an alpha particle‘is composed of two neutrons and
two protons.
Compute the binding energy
of the alpha particle.
11—1. Dene the millicurie of radon and of polonium. ,What is the
mass of one millicurie of polonium?
(0.0272 g.)
11—2. What is the saturation current produced in a ionizatioñ chamber
by 1 millicurie of polonium if all the alpha particles are completely
absorbed?
(1400 e.s.u. = 4.6 X 10“7 amp.)
11—3. The half—life period of thorium is 1.8 X 1010 years. What is
its transformation constant and average
life?
1-1—4. How many days after uranium Xl has been isolated before 90
per cent has changed to uranium X2? The half period of uranium Xl
is 24 5 days.
11—5. The transformation constant for radium is 1.35 X 10”11 per
second and its atomic weight is 226. The atomic weight of uranium I
is 238.
There are 3.44 X 10_7 gram of radium in equilibrium With each
.gram
of uranium I.
Calculate the half period
of uranium 1 in years.
11—6. One gram of radium emits 3.71 X 1010 alpha particles per sec—
ond. The transformation constant of radium emanation is 2.097 X 10“6
atom per second and its density is 0.00987 gr. per cc.
The number of
atoms per cc. of a monatomic gas is 2.705 X 10”.
Calculate the volume
,
and mass of one curie.
11—7. There are 13.6 ><‘1010 alpha particles emitted each second by
one gram of radium in equilibrium with its decay products. Calculate
the volume of helium produced by one gram of radium and its products
.
in one year.
"
(159 mm.3)
11—8. The number of alpha particles emitted per gram of radium each
_
'
Second is"3.71 ><
*If the atomic weight of radium is 226, what is its
«
half periodin years? One year = 3.156 >< 107 sec.
‘
'
‘
‘
Üranium 1 is freed from all;its
placedin a beta-ray
electroscope. HOW many days before the rate of fall of the leaf of the
_
" électros“copfe7 reaches“50% of "its maximum value?t The transformation
,
'“
X:is 3.275 >< 10“7.
'
‘
-.
:«;i:
…
personhas
radium today,
will he —
.
hfherdf10y Take thehalf—.1îfeof-radîùm 159Oy
;ÏLJ
11—11
:rst'
'
and:
determine
t1me necesSaryto reach %
;:eqùilibfiui