Mossbauer Diffractometer - New System as of January, 1999
Lead bricks on upper left are the shielding and collimator for the
57Co radiation source (collimator is shown open below).
A Siemens/Nicolet area detector is the circular metal unit on upper right.
The scintillation detector and preamp (middle right) are used for collecting
a conventional Mossbauer spectrum from the forward beam.
The sample is mounted on an arm attached to a removeable kinematic baseplate.
The protractor visible on the lower right is part of a goniometer from
an old but sturdy General Electric XRD-5
x-ray diffractometer. The goniometer is now used to rotate the Siemens/Nicolet
detector and/or the sample of the new Mossbauer diffractometer. Data collection, Doppler
drive and goniometer
motion are synchronized under computer control.
Above: Opened collimator for 14.41 keV gamma-ray beam.
The radiation source is mounted on the angled alumimum
disk towards the right (a dummy is shown here -- the actual
source is up to 145 mCi). The transducer to its right is used
for energy tuning in resonance scattering. The sample
for diffraction is mounted on the rotary stage at the left.
The position sensitive detector is out of the figure
to the left.
Mossbauer Diffractometer - Old System 1996-7
Below: Sighting along the path of the gamma-rays in the
Mossbauer powder diffractometer. The Inel CPS-120 position sensitive
detector is in the rear.
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