258
11.
SPONTANEOÜS DISINTEGRATION
EXPERIMENT 11—5
'
DECAY OF RADON
An emanation electroscope is used as in the preceding experiment but the decay rate of radon (radium emanation) is slower
than that for thorium emanation so that the activities at various
times may be determined more leisurely.
Seal some uranium ore, such as carnotite, With an equal amount
—
,
of sodium acid phosphate, in a long glass tube. Glass wool plugs
_
are used to keep the material in place. The ends of the tube are
drawn down to points when sealing off. The radon is allowed
_
accumulate for about two weeks.
A rubber tube is then slipped
.
over one end of the tube and connected to the partially evacuated
electroscope chamber. When ready to take the readings, heat the
tube, starting at its middle and working the ame both ways.
While this is being done, break the end of the tube inside the rubber
tubing and open the stop cock to the chamber. Then break the
far end of the glass tube so that air will sweep through the tube.
Finally close the stop cock. The chamber then contains the
radon.
«
'
Plot the activity curve from observations made at
of several hours and deduce the half period of radon.
.
REFERENCES
:
'
1. Reference A, page 246.
»
2.
Bateman, Phil. Mag., 20, 704 (1910). Also, General reference B,
Page 32'
_
3._ R. D. Evans and H. V. Neher, Phys. Rev., 45, 144 (1934).
j
4. RD. Evans and R.A. Mugele, Rev. Sci. Inst., 7, 441 (1936).
‘
Handbu‘c/z der Physik. Springer (1933)
Nuclear Phy—vics.q PrenticeHalls(1936)
3
‘
C—Rutherford,'Çhadwithand
from Radzoazv€
‘
î*
”
:
(1930).- Chàpter I-'
D——] . 'ChadWick,
cmd Radiaa'ctz‘be Suèsz‘ancesP1t[? ; …
and sens. (1923):— Chapters:;Ïg VI to IX…
«
11.
SPONTANEOÜS DISINTEGRATION
EXPERIMENT 11—5
'
DECAY OF RADON
An emanation electroscope is used as in the preceding experiment but the decay rate of radon (radium emanation) is slower
than that for thorium emanation so that the activities at various
times may be determined more leisurely.
Seal some uranium ore, such as carnotite, With an equal amount
—
,
of sodium acid phosphate, in a long glass tube. Glass wool plugs
_
are used to keep the material in place. The ends of the tube are
drawn down to points when sealing off. The radon is allowed
_
accumulate for about two weeks.
A rubber tube is then slipped
.
over one end of the tube and connected to the partially evacuated
electroscope chamber. When ready to take the readings, heat the
tube, starting at its middle and working the ame both ways.
While this is being done, break the end of the tube inside the rubber
tubing and open the stop cock to the chamber. Then break the
far end of the glass tube so that air will sweep through the tube.
Finally close the stop cock. The chamber then contains the
radon.
«
'
Plot the activity curve from observations made at
of several hours and deduce the half period of radon.
.
REFERENCES
:
'
1. Reference A, page 246.
»
2.
Bateman, Phil. Mag., 20, 704 (1910). Also, General reference B,
Page 32'
_
3._ R. D. Evans and H. V. Neher, Phys. Rev., 45, 144 (1934).
j
4. RD. Evans and R.A. Mugele, Rev. Sci. Inst., 7, 441 (1936).
‘
Handbu‘c/z der Physik. Springer (1933)
Nuclear Phy—vics.q PrenticeHalls(1936)
3
‘
C—Rutherford,'Çhadwithand
from Radzoazv€
‘
î*
”
:
(1930).- Chàpter I-'
D——] . 'ChadWick,
cmd Radiaa'ctz‘be Suèsz‘ancesP1t[? ; …
and sens. (1923):— Chapters:;Ïg VI to IX…
«