Fig. 1. Looking down a quartz-lined furnace at 1100˚C.
Growth of large crystals for field- portable gamma ray spectrometers
Elimination of external vibrations plays a key role in maintaining a stable growth process and maximising the total volume yield of very large crystals. Jim McMahon reports.
L’élimination des vibrations externes joue un rôle essentiel pour garantir un processus de culture stable et maximiser la production en volume totale des très grands cristaux. Jim McMahon nous l’explique.
Die Eliminierung externer Vibrationen spielt eine entscheidende Rolle für die Aufrechterhaltung eines stabilen Wachstumsprozesses und die Maximierung der Volumenausbeute großer Kristalle. Jim McMahon berichtet.
A
t Kansas State University, a facility is dedicated to the research and
development of new and innovative radiation detector technologies. Te Semiconductor Materials and Radiological Technologies (SMART) Laboratory is the largest university-based radiation detection laboratory in the country. It focuses on the detection of neutrons and gamma-rays, primarily those from special nuclear material (SNM) for homeland security applications. SMART Lab investigates and fabricates a variety of detectors which include compact low-power neutron detectors, high-resolution room-temperature- operated semiconductor gamma
www.scientistlive.com
ray spectrometers, pixelated devices for gamma ray or neutron imaging, and miniaturised gas- filled detectors. Te laboratory builds detectors from start to finish in readily deployable packages for use in better securing borders from nuclear materials such as plutonium and uranium.
Te gamma ray detection aspect of the laboratory’s research is focused on the discovery and development of new dense, high-Z* semiconductor materials, such as cadmium zinc telluride (CdZnTe or CZT) and mercuric iodide (HgI2), and several scintillator materials including lanthanum tribromide (LaBr3) and cerium tribromide (CeBr3).
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44