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Column Oven
and Detector
Oven
Temperature
Selection
In selecting ECD oven temperatures, consider the following:
•
The maximum permissible operating temperature of the radioactive foil is
400
°
C. This foil temperature cannot be reached, even when the
detector oven temperature is set to 450
°
C. Do not add additional
insulation material around the detector tower. Added insulation can
raise the foil temperature and reduce its operating lifetime.
•
A high detector oven temperature reduces the likelihood of
contaminating the foil with material bleeding from the column.
•
The higher the temperature of the foil, the greater the rate of migration of
the
63
Ni into the backing material. Rapid migration of the
63
Ni reduces the
electron flux and the lifetime of the foil.
•
Background noise increases with an increase in the detector and column
oven temperatures.
Use these guidelines to select the detector oven temperature:
•
Detector temperature should be at least 30
°
higher than the maximum
column temperature, but not less than 150
°
C.
•
To prevent column bleed from fouling the detector, wait for the detector
to reach its operating temperature before you increase the column
temperature.
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