Gamma Ray Imaging for Environmental Remediation (GRIER)

Johnson,W. N. ; Phlips, B. F. ; Kroeger, R. A. ; Kurfess, J. D. ; Phillips, G. ; Luke, P. N.

Naval Research Laboratory, Washington, DC

关键词: Dimensions;    Spectroscopy;    Lithium;    54 Environmental Sciences;    Capacitance;   

DOI  :  10.2172/828576
RP-ID  :  EMSP-60141--2000
RP-ID  :  A107-97ER62520
RP-ID  :  828576

美国|英语

来源: UNT Digital Library

【 摘 要 】

Germanium detector systems with both high spectral resolution and good imaging capabilities to the problems of environmental remediation. Over the last year, much progress has been made. We have (1) developed and built amorphous-contact germanium detectors of increasing sophistication, (2) built and tested an array of four position sensitive germanium detectors, (3) demonstrated spectroscopy and imaging uses with 235U, and Results from this research were presented at the EMSP's first workshop in Chicago in 1998, at the SPIE Session in July 1999, and at the IEEE Nuclear Science Symposium in November 1998 and 1999. AMORPHOUS CONTACTS The goal of the amorphous contact effort was to extend the single element (pixel) amorphous technology developed by Luke et al. (1994) to double-sided orthogonal strip detectors. Amorphous contact provides multiple advantages over the current lithium contact technology. We have fabricated the first orthogonal strip detector with dimensions appropriate for field use. The detector has an active volume of 50 mm x 50 mm x 10 mm and has 25 x 25 strips (see Figure 1). It is currently undergoing tests. The resolution is {approx}12 keV FWHM, which is dominated by electronic noise. The noise was high because of the large capacitance and the non-optimal electronics used with the test cryostat.