![](../img/smokedetectorpasco01.jpg)
The setup; Pasco Geiger-Müller tube, Science Workshop 500 Interface,
USB-to-serial cable, smoke detector, rods & clamps |
![](../img/smokedetectorpasco02.jpg)
A short (20 cm) rod threads into the G/M tube;
attach to long rod with right-angle clamp |
![](../img/smokedetectorpasco03.jpg)
The G/M tube plugs into Channel 1 of the Science Workshop Interface.
The USB-serial cable plugs in the back of the interface |
![](../img/smoke_metal.jpg)
Sort metal pieces into piles, place on
front bench
|
The
following demo is set up on the instructor's bench: |
![Setup](../img/rad_setup.jpg)
The demo setup
|
![Scope trace](../img/rad_trace.jpg)
The scope trace
|
![Counter](../img/rad_counter.jpg)
The Geiger counter in action |
![Counter connection](../img/rad_connection2.jpg)
Connections on back of counter:
Middle wire to Geiger Tube
Bottom wire to Oscilloscope
Gray wire to Timer
Brown wire to 120V AC |
![Oscilloscope](../img/rad_scope2.jpg)
See-thru oscilloscope |
![Scope connection](../img/rad_connection.jpg)
Connection from counter |
![Geiger tube](../img/rad_tube2.jpg)
Geiger tube with Radium source
(in small oval containers: Watson has them!) |
![Geiger tube](../img/rad_tube1.jpg)
Geiger tube in stand over source |
![Counter](../img/rad_voltage.jpg)
High voltage gets set to 1000 volts |
![Timer (with Jeff's thumb)](../img/rad_timer.jpg)
Turn timer on, or counter won't work! |