Imaging in presence of strong perturbations outside the FOV

When the camera is used in high radiation environments, the major gamma emission may be outside the FOV of the camera. In this case it is important that: Compton cameras are superior to collimator based systems in such situation, because they can detect imaging radiation on 4pi.On the compton cameras, our camera is specially suited for those situations because: Below are tests illustrating our claims: […]

Crude triangulation of 2 sources of the same isotope using the Temporal Binocular

We have 2 sources of 22Na: 0,1 MBq at 40 cm 0,14 MBq at 60 cm We have done a single 5’ acquisition using the Temporal Binocular Compton camera. Then we have reconstructed the image by varying the reconstruction plane distance from 40 cm to 100 cm The best image for each source is obtained when the reconstruction distance is correct.

Reading a clock

Image of a radium painted clock obtained from 20 cm: Dose rate = 40 nSV/h; Acquisition time 1/2h. Image is slightly distorted by proximity to the camera.

Imaging of activated materials

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 […]

Neutron activation & fissile materials

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 […]

High count rate acquisition

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 […]

Homeland security and wastes management

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

High quality gamma Imaging

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% […]

Imaging of heavily shielded sources

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: 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 […]

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