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Title: SSPM Demonstration.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the Process Monitoring Workshop.
Country of Publication:
United States

Citation Formats

Cipiti, Benjamin B. SSPM Demonstration.. United States: N. p., 2014. Web.
Cipiti, Benjamin B. SSPM Demonstration.. United States.
Cipiti, Benjamin B. Sat . "SSPM Demonstration.". United States. doi:.
title = {SSPM Demonstration.},
author = {Cipiti, Benjamin B.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Nov 01 00:00:00 EDT 2014},
month = {Sat Nov 01 00:00:00 EDT 2014}

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  • Silicon-based photodetectors offer several benefits relative to photomultiplier tube–based scintillator systems. Solid-state photomultipliers (SSPM) can realize the gain of a photomultiplier tube (PMT) with the quantum efficiency of silicon. The advantages of the solid-state approach must be balanced with adverse trade-offs, for example from increased dark current, to optimize radiation detection sensitivity. We are designing a custom SSPM that will be optimized for green emission of thallium-doped cesium iodide (CsI(Tl)). A typical field gamma radiation detector incorporates thallium doped sodium iodide (NaI(Tl)) and a radiation converter with a PMT. A PMT’s sensitivity peaks in the blue wavelengths and is wellmore » matched to NaI(Tl). This paper presents results of photomultiplier sensitivity relative to conventional SSPMs and discusses model design improvements. Prototype fabrications are in progress.« less
  • This paper describes direct photon counting data on several pixels of the Rockwell SSPM detector array, about which absolute single photon detection efficiencies and time responses were reported previously by Kwiat et al. The new data shows a substantially larger efficiency, 85%, and suggests that damage in the optical fiber employed in the earlier data was responsible for the lower number, 70%. When the results of this paper are analyzed using reasonable assumptions, one concludes that several improvements of the SSPM detector are still possible to bring the photon counting efficiency close to or larger than 95%.
  • Abstract not provided.
  • Eastern Europe (EE) and the former Soviet Union (FSU) republics have areas that are contaminated with radioactive and hazardous constituents. The Westinghouse Hanford Company is exploring the feasibility of establishing a collaborative effort with various US agencies to establish an International Integrated Demonstration (IID). Westinghouse manages the waste management and cleanup programs at the US Department of Energy`s (DOE) Hanford Site. The purpose of the IID would be to (1) facilitate assistance to EE/FSU cleanup efforts, (2) provide hands-on management and operational assistance to EE/FSU countries, (3) provide a basis for evaluating opportunities for and establishing future collaborations, and (4)more » evaluate the applicability of US technologies to both US and EE/FSU cleanup efforts. The DOE`s Integrated Demonstration Programs are currently providing the conduit for development and demonstration and transfer and deployment of innovative technologies to meet DOE`s cleanup need for hazardous and radioactive wastes. The Integrated Demonstrations are focused on all facets of environmental restoration including characterization, remediation, monitoring, site closure, regulatory compliance, and regulatory and public acceptance. Innovative technologies are being tested and demonstrated at host sites across the country to provide the necessary performance data needed to deploy these technologies. The IID concept would be to conduct an Integrated Demonstration at one or more EE/FSU host sites.« less
  • The Savannah River Site (SRS) Integrated Demonstration focuses on Clean-up of Soils and Groundwater Contaminated with Chlorinated VOC. Several laboratories, including SRS, had demonstrated the ability of methanotrophic bacteria (found in soil and aquifer material) to completely degrade or mineralize chlorinated solvents. The test consisted of injecting methane mixed with air into the contaminated aquifer via a horizontal well and extracting it from the vadose zone via a parallel horizontal well. Ground water was monitored biweekly from 13 wells for a variety of chemical and microbiological parameters. The water from wells in affected areas showed increases in methanotrophs of moremore » than 1 order of magnitude every 2 weeks for several weeks after 1% methane in air injection started. Simultaneous with the increase in methanotrophs was a decrease in water and soil gas concentrations of trichloroethylene (TCE) and tetrachloroethylene (PCE). In two wells, the TCE/PCE concentration in the water declined by more than 90%, to below 2 ppb. All of the wells in the zone of effect showed significant decreases in contaminants in less than 1 month. In four of five vadose-zone piezometers (each with three sampling depths) concentrations declined from as high as 10,000 ppm (vol/vol) to less than 5 ppm in less than 6 weeks. The fifth cluster also declined by more than 95%. A variety of other microbial parameters increased with methane injection, indicating the extent and type of stimulation that had occurred.« less