Author Archives: Lambert

gamma tomography after neutron irradiation

A test whether we can image milligrams of metals tomographically using the SPECT scanner. These tomographic scanners are used for medical imaging, but here we have use neutrons to generate the gamma isotopes.

Milligrams of metals can still be tomographically imaged. The tomographic data was collected hours after the neutron irradiation.

A look around the 3D reconstructed gamma tomogram of milligrams of different materials, irradiated with neutrons.

This example serves to demonstrate the feasibility of the principle and approximately sets the lower limit of the dimensions we can 3D reconstruct (millimeters). The limit is mostly determined by the mass of these tiny (milligrams!) test objects, linked to the neutron flux which results in the gamma brilliance.

A collaboration between Marlies Goorden (Beekman group, dep. RST, fac. Applied Sciences) and Lambert van Eijck (Pappas group, dep. RST, fac. Applied Sciences) with the excellent help from RID Mehmet Sarilar (INAA), Rob Kreuger (Beekman group), Arend van Duijn (HOR/TD), under supervision of Henk van Doorn (SBD).

fresh examples on the other page!

The “Examples” page in the tabs on the top of the web site contain some neutron images and movies, taken at a TU Delft neutron test beam line. These are meant to trigger you with some ideas of what can be done with neutron imaging. There’s no data treatment, low resolution and no dark-field or beam-inhomogeneity corrections!

proposal for FISH submitted!

for the weblogThe next step is the reviewing process by NWO; by October 2015 we should get feedback on how the proposal is ranked.

cylinder lock

A typical cylinder lock that we bought from the DIY hardware store, imaged with neutrons: despite the low intensity of the neutron beam and the medium resolution of the detector, this example does demonstrate what the particular capabilities are of the future FISH neutron imaging station: the interior mechanics (including the key coding levers and even the springs) are visualized without taking the lock apart.

Neutron imaging at low intensity and low resolution can already reveal the interior of a door lock. FISH will do this 10 times faster at higher resolution.

Neutron imaging at low intensity and low resolution can already reveal the interior of a door lock. FISH will do this 10 times faster at higher resolution.

This non-invasiveness of the technique can be beneficial in solving many scientific and technological questions. As an example we show a short movie, starting with a ‘clean lock’ and then spraying some WD-40 lubricant (also bought from the DIY shop) in the ‘key entry’. The lock is place vertically in the beam (one lock entry on top, one on the bottom) and with time, you see some of the lubricant flowing to the bottom. Again: non-invasive. Inner lubrification using even tiny amounts of very very viscous WD-40 is visible.

Redistribution of lubricant over 5h30m in 10sec steps:
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Redistribution of lubricant over 3hm in 10sec steps, starting from a clean cylinder:

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fruitful discussions!

The FISH workshop held in Utrecht last week was very fruitful indeed. Many people in the audience had no experience with neutrons at all and the experts showed them around in the field of imaging. The feedback session held and organised by Fleur and Daphne wrapped up the formal part: the user community gave their ideas/outlook on what they would like to do FISH, once it is built. This session gave a nice overview of what is needed and where the priorities are, which serves as an input for ranking the instrument capabilities. Discussions and brainstorming continued during the drinks-session.

Discussions during one of the presentations of the FISH workshop in the Karel V in Utrecht.

Discussions during one of the presentations of the FISH workshop in the Karel V in Utrecht.

FISH workshop

Hereby we announce the FISH workshop to be held in Utrecht on the 17th of April 2015! If you are a potential user of neutron imaging from science or industry, this workshop is for you: experts from the field will present the current state-of-the-art in neutron imaging and we will explain our plans to build a neutron imaging station in Delft. For which we need your input, because the different capabilities of the instrument should be ranked according the highest demand.

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Delft @ NEUWAVE 5

The imaging workshop NEUWAVE in Lund Sweden is taking place at the moment. FISH is there mostly to learn about what’s going on and what the newest developments are.

The Neuwave logo with the famous bridge between Sweden and Denmark in the back.

top ranking by international advisory committee

FISH was ranked Number 2, just behind the PEARL neutron diffractometer by an international advisory committee that assessed the capabilities opened up by the OYSTER Program. Good news for FISH, since this helps to start working and try to get funding for the work!

a FISH was born from OYSTER!

The management team of the Radiation Science and Technology department and the Reactor Institute Delft (RID) has today decided to go forward with the conception of FISH: the first neutron imaging station in Delft. It will be located at the research reactor of the  TU Delft, Netherlands. FISH will complement the  OYSTER program, for the upgrade of the reactor, that runs since January 2012.

This weblog will keep you up to date with the developments in the design and construction of this neutron imaging station.