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Title: Proton radiography based on near-threshold Cerenkov radiation

Abstract

A Cerenkov imaging system for charged particle radiography that determines the energy loss of the charged particle beam passing through an object. This energy loss information provides additional detail on target densities when used with traditional radiographic techniques like photon or x-ray radiography. In this invention a probe beam of 800 MeV to 50 GeV/c charged particles is passed through an object to be imaged, an imaging magnetic spectrometer, to a silicon aerogel Cerenkov radiator where the charged particles emitted Cerenkov light proportional to their velocity. At the same beam focal plane, a particle scintillator produces a light output proportional to the incident beam flux. Optical imaging systems relay the Cerenkov and scintillator information to CCD's or other measurement equipment. A ratio between the Cerenkov and scintillator is formed, which is directly proportional to the line density of the object for each pixel measured. By rotating the object, tomographic radiography may be performed. By applying pulses of beam, discrete time-step movies of dynamic objects may be made.

Inventors:
 [1];  [2]
  1. (Berkeley, CA)
  2. (Walnut Creek, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
875045
Patent Number(s):
6518580
Assignee:
The United States of America as represented by the United States Department (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
proton; radiography; based; near-threshold; cerenkov; radiation; imaging; charged; particle; determines; energy; loss; beam; passing; information; provides; additional; detail; target; densities; traditional; radiographic; techniques; photon; x-ray; probe; 800; mev; 50; gevc; particles; passed; imaged; magnetic; spectrometer; silicon; aerogel; radiator; emitted; light; proportional; velocity; focal; plane; scintillator; produces; output; incident; flux; optical; systems; relay; ccds; measurement; equipment; ratio; formed; directly; line; density; pixel; measured; rotating; tomographic; performed; applying; pulses; discrete; time-step; movies; dynamic; particle beam; charged particle; cerenkov radiation; energy loss; /250/

Citation Formats

van Bibber, Karl A., and Dietrich, Frank S. Proton radiography based on near-threshold Cerenkov radiation. United States: N. p., 2003. Web.
van Bibber, Karl A., & Dietrich, Frank S. Proton radiography based on near-threshold Cerenkov radiation. United States.
van Bibber, Karl A., and Dietrich, Frank S. Wed . "Proton radiography based on near-threshold Cerenkov radiation". United States. https://www.osti.gov/servlets/purl/875045.
@article{osti_875045,
title = {Proton radiography based on near-threshold Cerenkov radiation},
author = {van Bibber, Karl A. and Dietrich, Frank S.},
abstractNote = {A Cerenkov imaging system for charged particle radiography that determines the energy loss of the charged particle beam passing through an object. This energy loss information provides additional detail on target densities when used with traditional radiographic techniques like photon or x-ray radiography. In this invention a probe beam of 800 MeV to 50 GeV/c charged particles is passed through an object to be imaged, an imaging magnetic spectrometer, to a silicon aerogel Cerenkov radiator where the charged particles emitted Cerenkov light proportional to their velocity. At the same beam focal plane, a particle scintillator produces a light output proportional to the incident beam flux. Optical imaging systems relay the Cerenkov and scintillator information to CCD's or other measurement equipment. A ratio between the Cerenkov and scintillator is formed, which is directly proportional to the line density of the object for each pixel measured. By rotating the object, tomographic radiography may be performed. By applying pulses of beam, discrete time-step movies of dynamic objects may be made.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {1}
}

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