Dynamic Neutron Radiography
Dynamic neutron radiography (dNR) is utilized for time-dependent, nondestructive investigations. This approach enables engineers and scientists to acquire real-time data and observe the inner workings of a system whose components often cannot be seen using other radiation modalities, such as x-rays.
As a result of their interactions with matter, neutrons, like x-rays, provide an image of transmitted radiation (i.e., a neutron radiograph). Unlike x-ray interactions, however, which are highly dependent on the atomic number of the matter, neutron interactions do not depend on the atomic number. For instance, although lead effectively shields x-rays, it is practically transparent to neutrons. Because x-rays and neutrons interact differently with matter, these two radiation modalities highlight complementary properties of an object’s internal structure.
Dynamic neutron radiography is very useful for investigations such as those related to combustion engines, fuel cells, and two-phase flow systems. The benefits of dNR imaging for scientific and industrial applications will continue to grow as the need to ‘see past’ metallic components and observe small amounts of organic materials keeps increasing.
Refer to “Dynamic Neutron Radiography” for more information.
For dynamic neutron radiography, we recommend our
PI-MAX4:2048f ICCD camera, which provides four times the imaging area of any other currently available intensified CCD camera. This larger imaging area enables the collection of more data per image, a critical advantage given the cost of operating a neutron source. Featuring a 2k x 2k CCD fiberoptically coupled to one of several 25 mm diameter Gen II or Gen III filmless intensifiers, it is the only ICCD camera on the market today to offer high frame rates at 6 MHz / 16-bit digitization as well as a 1 MHz sustained gating repetition rate. An integrated programmable timing generator, SuperSynchro, built into the camera makes it a perfect choice for dynamic neutron radiography.
Rapid periodic processes can be observed via a chronological series of precisely triggered, short exposures. Movie shows a chainsaw running at 8000 rpm, produced with exposure times of 50 microseconds. Images acquired using a PI-MAX:1300 ICCD camera. Courtesy of Dr. Christian Gru¨nzweig, Neutron Imaging and Activation Group, Paul Scherrer Institut, Switzerland. To view a movie of the fully recorded rotation, go to www.psi.ch/niag/dynamic-neutron-radiography
|A typical setup for dynamic neutron radiography using an ICCD camera is similar to that shown below, although for dNR the camera intensifier’s gating must be synchronized with the periodicity of the system under study.|
Typical experimental setup for neutron radiography. Adapted from Nanda et al., Journal of Physical Chemistry C, 2012.
Dynamic Neutron Radiography
Novel (3D) Neutron Imaging technique for nondestructive testing made possible by large-area, intensified CCD camera system
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