Radiation imaging

EG G Heimann Optoelectronics GmbH, Wiesbaden, Germany Radiation Image Detector RIS 256 - Datasheet... 

Medical Uses. A significant usage of chelation is in the reduction of metal ion concentrations to such a level that the properties may be considered to be negligible, as in the treatment of lead poisoning. However, the nuclear properties of metals may retain then full effect under these conditions, eg, in nuclear magnetic resonance or radiation imaging and in localizing radioactivity. 

Research on large area electronic arrays of a-Si H devices started a few years later after the first field effect transistors were reported (Snell et al. 1981). These devices take advantage of the capability to deposit and process a-Si H over large areas. Applications include liquid crystal displays, optical scanners and radiation imagers. Present devices contain up to 10 individual elements and are presently used in handheld televisions and FAX machines. 

J. Miyahara The imaging plate A new radiation image sensor. Chem. Today 223, 29 (1989)... 

Polymeric layer for a radiation image phosphor or scintillator panel 102... 

The importance of these tlnee phenomena varies from one image to an other according to the nature of the metal, the thickness of the piece and the type of radiation employed. 

Let the problem of focusing laser radiation into the smooth curve L have a smooth solution function (p, rf)e.C (G). Then the inverse image of each point M ff) EiL is a certain segment F (ff) S G. ... 

Contrast Ratio Cq The contrast ratio is established on the basis of the ratio of the amplitude of the unattenuated radiation to the amplitude after attenuation through a test piece. This test piece is a lead disk which is mounted in the middle of the image converter it masks approximately 10% of the surface of the image converter. 

Real Time Radiography (RTR) is an advanced method of radiography in which the image is formed while the job is exposed to ionising radiation. RTR is often applied to objects on assembly lines for rapid inspection. Accept-or-reject decisions may be made immediately without the delay or expense of film development. The main advantages of RTR are thus, reduction in inspection cost and processing time. 

The sensitivity curves are plots of maximum achieved sensitivity as a function of thickness of the object for a given focal spot size and source to detector distance. The best attainable sensitivity in image intensifier systems is a function of tube voltage, current, scattered radiation and the screen gamma. As a first step, stainless steel plates with thicknesses ranging from 5 mm-30 mm in steps of 5 mm were chosen. These plates had a length of 950 mm and width of 280 mm. The plate is positioned very close and at the center to the LI. tube. The extraneous... 

An X-ray image of a test object is converted by a X-ray TV unit (4), and complete video-signal from it is supplied to specialized computer (5). For conversion of X-ray images series X-ray vidicons LI-444 and LI-473 can be used or experimental X-ray vidicons of the same dimensions with a Be input window [2] sensitive to soft X-radiation developed in Introscopy Institute. >. ... 

The flexible large area screen with photostimulable phosphor called the imaging plate, which temporarily stores the image induced by the ionizing radiation, e g. by X-rays, electrons or other charged particles ... 

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