Preliminary Report on the Evaluation of an Electron-Positron Collider as a source of Monoenergetic Photons

Technical Report · Mon Nov 30 00:00:00 EST 2009

DOI:https://doi.org/10.2172/983736· OSTI ID:983736

Fast, James E; Campbell, Luke W

Abstract Active interrogation methods are being investigated to detect shielded special nuclear material (SNM). These approaches utilize either neutron or photon beams to excite the SNM in concert with either neutron or gamma ray detectors to observe the stimulated emissions. The two primary methodologies with photon beams are photofission and nuclear resonance florescence (NRF). Photofission requires photons energies of 7-10 MeV while NRF requires photon energies around 2 MeV. For both techniques, photons that are not in the appropriate energy band, e.g. the low energy tail of a Bremsstrahlung photon beam, contribute unwanted additional radiation dose to cargo. Typically less than 10% of the photons are in the usable energy band. The additional photon production generates a commensurate amount of additional radiation dose in the source and target areas, impacting shielding requirements and/or dose to operators and equipment and at the expense of a similar increase in power consumption. Hence it is highly desirable to produce narrow energy (“monoenergetic”) photon beams with tunable energy in the range of ~2-20 MeV.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 983736
• Report Number(s): PNNL-SA-70285; NN2001000; TRN: US1005029
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABSTRACTS
BREMSSTRAHLUNG
CARGO
DOSES
ENERGY
EQUIPMENT
EVALUATION
MATERIALS
NEUTRONS
PHOTOFISSION
PHOTON BEAMS
PHOTONS
POWER
PRODUCTION
RADIATION DOSES
RANGE
RESONANCE
SHIELDING
STIMULATED EMISSION
TARGETS
Preliminary Report on the Evaluation of an Electron-Positron Collider as a source of Monoenergetic Photons