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THYAC (ALPHA CONVERTED)
The converted thyac with circuit changes to increase the trigger period
and integration constant seems to be a very good field unit.
It has not
shown itself to be moisture or temperature sensitive. The probe must be
handled gently and a rather high photo multiplier mortality rate has been
notede
A guard ring should be added as further protection of the very thin
mylar windowe
The probe may be used for short periods of time in any desired
position due to the high viscosity of the silicone coupling compound and
shape of its cavity in the light pipe.
The unit is capable of calibration to provide ly readings with reasonable ageuracye '
Due to our lack of range in alpha sources they have only been checked at 00,
1800, 8800 and 3320 d/me
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