Modern Physics > Nuclear Physics > Radioactivity
|
DCS# 7D30.30 |
MAGNETIC DEFLECTION OF
BETA PARTICLES
-
APPARATUS
| survey meter |
015B |
lead brick with hole
|
015B |
Cl-36 source (the more active of
the two)
|
015B-lead cabinet |
aluminum
plate with hole
|
202-04-C6
|
strong magnet
|
206 |
DESCRIPTION
- With the survey meter in the path
of a collimated beam of beta particles from a Cl-36 source, the count
rate is high, as can be heard from the speaker.
Deflect the
beam by placing the pole of a strong bar magnet next to the hole in the
aluminum plate, and the count rate can be heard to drop to almost
background. Locate the deflected beam by swinging the detector in
an arc until a maximum in the count rate can be heard.
NOTES
Secure the
source to the back of the hole in the brick. Place the aluminum
mask over the hole to
collimate the beam of particles from the Cl-36 source. Set the
survey meter in the direct beam, about 10 cm away from the aluminum
mask. The count rate is about 200 cpm.
Mark the north pole of the magnet.