807
Vacuum Chamber
- For routine alpha/beta counting
- Convenient and durable
- Sample-to-detector distance easily set and measured
- Can be used for beta-gamma coincidence measurements
- Single valve for pumping and venting
The ORTEC Model 807 Vacuum Chamber is designed for routine alpha/beta
counting applications using a semiconductor radiation detector and a radioactive sample.
Two examples of the many applications possible with this convenient and durable chamber
are its use in educational laboratories to demonstrate detectors and counting principles,
and in radiological laboratories for smear counting.
The detector is mounted in the center of the chamber cover, and the
sample is mounted on one of three support rods at a preselected distance from the
detector. This design makes it possible to establish and measure the detector-to-sample
distance before the assembly is placed in the chamber. Because of easy access, the
detector can be changed without the detector being touched. Another convenience is that
the support rods on the sample mounting can be used as legs to support the cover when it
is out of the chamber.
An opening in the wooden base allows an effective-geometry gamma detector
to be placed against the bottom of the thin stainless steel chamber for beta-gamma
coincidence measurements. In this application, an extension cable is used to mount the
semiconductor detector close to the chamber base.Since the vacuum pump and vent functions are combined in a single valve,
the vacuum pump does not have to be turned off while the samples are being changed. A
quarter turn of the valve opens the chamber to vacuum while sealing off the vent passage.
The Model 807 is both functional and attractive, with its main housing
made of stainless steel and mounted on a varnished wood base. The valve is nickel-plated
and has a 0.09 cm (0.25 in.) hose connector for the vacuum line. (NOTE: A Welch 1402, or
larger, mechanical pump with proper interconnecting base is recommended for use with this
chamber.)The photograph also shows a measurement scale attached to a leg of the
chamber cover. The scale measures the sample-to-detector distance.
ORDERING INFORMATION
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Model |
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Description |
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807 |
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Vacuum Chamber |
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