UltraLo-1800 Alpha Particle Counter
XIA LLC
Page 26
2.
Counting Module
Side View (Panel Removed)
1.
Electronics box, houses the electronics that perform many of the communication and
counting functions of the UltraLo. These include:
o
Processing electronics: Digitize the incoming signals, look for triggers, send data to the
Control Laptop (not shown).
o
HV generation: Generates the High Voltage needed for electron drift (not shown).
o
Communications: Communicates both signals and device information (e.g. high voltage
bias, moisture) values to the Control Laptop (not shown).
2.
Upper Chamber, contains:
a.
Preamplifiers: Analog amplification of the signals coming from the Active Volume.
b.
Moisture meter: Measures the moisture in the Active Volume in order to ensure a dry
counting environment.
c.
Active Volume (ionization chamber). Includes:
Electrodes: The drifting electrons induce charge via the electrodes (not shown).
Fieldshapers: Ensure that the electric field is uniform (not shown).
3.
Lower chamber, introduces samples into the Active Volume. Primarily contains:
o
Tray/Door mechanism: Connects the motor to the tray and door, so that samples may
be introduced and a gas seal created in a reliable manner (not shown).
Figure IV-1: Side view of counting module with the panel removed.
