Imaging of heavily shielded source

With our Compton Camera, thanks to it’s high spatial resolution and good signal/noise ratio, it is possible to image on a single aquisition:

1. Heavily shielded sources;
2. Weaknesses in source shielding using diffused photons;
3. In some case even the shielding itself.

In this case we are observing a high activity (>1GBq) ⁹²Ir source inside a the Uranium shielding of a gammagraph.

The source is shielded by at least 10 cm of Uranium. The observation time is 5 min:

1 – Using the weak 882 keV Line from ⁹²Ir it is possible to clearly see the shape of the Iridium source:

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2 – Using diffused photons around 600 kev we see the mechanism for moving the source (i.e weaknesses in the shielding)

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3 – Using Breamstrahlung photons from 234 Pa present in Uranium shielding we see the Uranium shielding

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