We have observed cubes of concrete in storage. Those cubes have been activated by neutrons.  In those cubes we have observed the following radio-elements: Ba 133 Co 60 Eu 152 Eu 154 Below we see the image of 60Co activation. The activity is weak (1 MBq is seen from 4m). The activity is present in metallic rods reinforcing the concrete structure. It seems to be […]

Fissile materials (235U, 241Am, Plutonium…) emit neutrons. Those neutrons are captured in their surrounding and emit prompt gamma rays that Temporal Compton camera detect well. It is imposible to detect directly the weak lines of 235U (185 keV) or Plutonium which are below 300 keV with a compton camera. Anyway those lines are difficult to correctly image with coded mask cameras in realistic situations because they are screened […]

Our camera can be used in the standard mode till 1mSV/h.  At those high count rate, the acquisition time should be short although: you can get 22.000 events in 10 seconds! We have also identified a mode allowing to use our camera at 6msV/h or even 10 mSV/h. This requires a specific hardware and must be specified in your order. On the image below you […]

Container  with a roughly 1 MBq 60Co source seen from 3m (30’ image)

The unique gamma image of 2 60Co sources obtained by Temporal V3: 2 60Co sources in the lab with a large intensity contrast (1 to 8) are clearly separated with an angular separation of 10° ;Activity of the main source 300 kBq ;Distance to main source = 0,8m ;Acquisition duration 1h (in order to get > 500 photons from the weakest source) ;Threshold = 14% […]

With our Compton Camera, thanks to it’s high spatial resolution and good signal/noise ratio, it is possible to image heavily shielded sources. In this case we are observing a high activity (1GBq) ¹³⁷Cs source used for level gauging. The source is shielded by 20 cm of lead. In 10 minutes using the 80 photons on a total 20.000 selected on the ¹³⁷Cs peak (662 +/- […]

The binocular camera with its dual head configuration allows to estimate the true distance to a radiative source using gamma emission triangulation. This opens the way to quantitative imaging of contamination. A first trial has been done in a decommissioned power plant. The maximum activity on the wall was 0,2uSV/h (red spot). The gamma FOV (76°) is slightly smaller than the optical image (90×90). The […]