scholarly journals ACCELERATED SITE TECHNOLOGY DEPLOYMENT COST AND PERFORMANCE REPORT COMPARABILITY OF ISOCS INSTRUMENT IN RADIONUCLIDE CHARACTERICATION AT BROOKHAVEN NATIONAL LABORATORY

2001 ◽  
Author(s):  
P. KALB ◽  
L. LUCKETT ◽  
K. MILLER ◽  
C. GOGOLAK ◽  
L. MILIAN

2014 ◽  
Vol 27 ◽  
pp. 1460139
Author(s):  
ISTVAN DIOSZEGI ◽  
GRAHAM C. SMITH ◽  
NEIL A. SCHAKNOWSKI ◽  
BO YU ◽  
JACK FRIED ◽  
...  

A new generation of coded aperture neutron imagers is being developed at Brookhaven National Laboratory. The detector of the camera is a position sensitive thermal neutron chamber. The new device is a 3 He -filled ionization chamber, which uses only anode and cathode planes. The anode is composed of an array of individual pads. The charge is collected on each of the individual 5 × 5 mm2 anode pads, (48 × 48 in total corresponding to a 24 × 24 cm2 sensitive area) and read out by application specific integrated circuits. The new design has several advantages for the field of coded aperture applications compared to the previous generation of wire-grid based neutron detectors. Among these are the rugged design, lighter weight and use of non-flammable stopping gas. The pad-based readout is event by event, thus capable of high count rates, and can perform data analysis and imaging on an event by event basis. The spatial resolution of the detector can be better than the pixel size by using charge sharing between adjacent pads. In this paper, we will report on the development and performance of the new, prototype pad-based neutron camera and present the first pad-based coded aperture images of thermalized neutron sources.



1982 ◽  
Vol 15 ◽  
Author(s):  
G. Bida ◽  
D. R. Mackenzie

In support of the responsibility of the Nuclear Regulatory Commission (NRC) to promulgate a regulation for disposal of high level waste in a geologic repository, a technical support program was conducted at Brookhaven National Laboratory (BNL). The principal objectives of the program were (1) to identify and provide an understanding of those factors and processes which affect repository performance, and (2) to provide the information needed to develop and support proposed regulations, criteria, and performance objectives that will ultimately be issued as the final rule for disposal of high level radioactive wastes in geologic repositories, known as 10 CFR 60 [1]. As part of the technical support program in the development of nuclear waste form criteria, three main areas of transuranic (TRU) waste management have been evaluated: immobilization processes and waste forms proposed for ultimate geologic disposal of TRU waste; management of TRU waste by decontamination; and potential problems associated with gas generation by certain TRU wastes [2]. The evaluation results from a review of, primarily, relevant DOE research and development efforts reported up to the end of CY 80. Also, only the definitions, criteria, and performance objectives detailed in the Advance Notice of Proposed Rulemaking (10 CFR 60) [3] were considered in this evaluation. This is important to note since significant differences in the waste package definition and in the statement of performance objectives as well as in other areas exist between the Advance Notice [31 and the Proposed Rule [1].



1975 ◽  
Vol 130 (2) ◽  
pp. 379-425
Author(s):  
J.A. Bamberger ◽  
D.P. Brown ◽  
C.L. Goodzeit ◽  
D.A. Kassner ◽  
R.I. Louttit ◽  
...  


Author(s):  
H. Ade ◽  
B. Hsiao ◽  
G. Mitchell ◽  
E. Rightor ◽  
A. P. Smith ◽  
...  

We have used the Scanning Transmission X-ray Microscope at beamline X1A (X1-STXM) at Brookhaven National Laboratory (BNL) to acquire high resolution, chemical and orientation sensitive images of polymeric samples as well as point spectra from 0.1 μm areas. This sensitivity is achieved by exploiting the X-ray Absorption Near Edge Structure (XANES) of the carbon K edge. One of the most illustrative example of the chemical sensitivity achievable is provided by images of a polycarbonate/pol(ethylene terephthalate) (70/30 PC/PET) blend. Contrast reversal at high overall contrast is observed between images acquired at 285.36 and 285.69 eV (Fig. 1). Contrast in these images is achieved by exploring subtle differences between resonances associated with the π bonds (sp hybridization) of the aromatic groups of each polymer. PET has a split peak associated with these aromatic groups, due to the proximity of its carbonyl groups to its aromatic rings, whereas PC has only a single peak.





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