Unusual Condenser Ionization Chamber of Carl Braestrup (1940s, 1950s)
This unusual condenser chamber tube belonged to Carl
Braestrup at New York’s Francis
The plastic condenser chamber is 3 1/2" in diameter and 6 " tall. The black coating on the inside is probably aquadag.
What is unusual about this device is the fact that it is connected to a direct reading pocket dosimeter (Victoreen 541/A) which would provide the readout.
How it was used is anybody's guess. Here is mine.
|I suspect that it was
designed to increase the sensitivity of the pocket dosimeter, which would
normally cover the exposure range from 0 to 200 mR, by effectively
increasing the size of the dosimeter's chamber. If true, its use would
have required a calibration curve. The chrome-plated adapter on the top of
the condenser chamber (photo above right) has a button on the front that
might have been used to adjust the fiber's position. The adapter also has
an opening (facing right in the photo) that allows light in so that the
dosimeter can be read while connected to the condenser chamber.
It is almost certain that it was used to measure x-rays, possibly scattered radiation from an x-ray tube.
Donated by Cecilia and Maureen Mooney.
Copyright 1999, Oak Ridge Associated Universities