Development of an intense, pulsed source of combined characteristic-gamma-rays and neutrons to induce fission

Commisso, R.J.; Schumer, J.W.; Apruzese, J. P.; Allen, R.J.; Cooperstein, G.; Hinshelwood, D.D.; Jackson, S. L.; Mosher, D.; Murphy, D.P.; Ottinger, P. F.; Phipps, D.G.; Swanekamp, S. B.; Weber, B.V.; Young, F.C.; Hunt, A. W.; Gagliardi, Marcus A.; Seipel, Heather

doi:10.1109/plasma.2010.5533958

Cited by 1 publication

(8 citation statements)

References 2 publications

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“…The 6 Li-loaded-glass-scintillator detector consists of a 12.7-cm-diameter, 0.2-cm-thick NE-912 6 Li-loaded-glass scintillator coupled to a 5.1-cm-diameter 9635B photomultiplier tube by a 3.5-in-long Lucite light pipe. Neutrons entering the 6 Li-loaded-glass scintillator react via the 6 Li(n,α) 3 H reaction, which has Q = +4.78 MeV.…”

Section: E Detectors Used To Measure Delayed Neutrons Resulting Frommentioning

confidence: 99%

“…It consists of a 17.8-cm-diameter, 7.6-cm-thick HDPE cylinder bored out to accommodate the scintillator with a moderator thickness of 3.8 cm in the forward direction. The 6 Li detector was originally developed to measure high-energy neutrons from dd and d-t fusion reactions [20], and its thickness was adjusted, but not rigorously optimized, for fission neutron measurements. The moderator itself is also covered by a 0.0635-cm-thick cadmium shield to filter out background neutrons thermalized by room scattering.…”

Section: E Detectors Used To Measure Delayed Neutrons Resulting Frommentioning

confidence: 99%

“…The 6 Li detector was fielded 26 cm from the inspection object, oriented at 90° to the diode axis so that it faced the inspection object but not the diode and PTFE γ-ray source. A substantial amount of lead was used in the directions of the diode and the PTFE γ-ray source to shield the sensitive PMTbased detector and speed its recovery after the probing pulse.…”

Section: E Detectors Used To Measure Delayed Neutrons Resulting Frommentioning

confidence: 99%

“…Experimental arrangement used to determine the response of the depleted uranium inspection object to probing radiation from the PTFE γ-ray source. The 6 Li detector and three 3 He detectors were positioned on opposite sides of the inspection object to detect delayed neutrons from induced photofission.…”

Section: E Detectors Used To Measure Delayed Neutrons Resulting Frommentioning

confidence: 99%

“…A less common approach to active detection is the use of a single, intense pulse of probing radiation, referred to here as intense pulsed active detection (IPAD) [6], [7]. The physics of the approach is the same as the LINAC approach-electrons or ions are accelerated into a converter that produces the probing radiation-with an important difference.…”

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confidence: 99%

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Detectors for intense, pulsed active detection

Jackson

Allen

Apruzese

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

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In intense, pulsed active detection, a single, intense pulse of radiation is used to induce photofission in fissionable material, increasing its detectability. The Mercury pulsed-power generator was converted to positive polarity (+3.7 MV, 325 kA, 50-ns FWHM) to drive an intense, pulsed radiation source based on the FIGARO active detection concept. The probing radiation source consisted of an ion-beam diode and a thick PTFE (Teflon) converter where 6 -7 MeV γ-rays were produced via the 19 F(p,αγ) 16 O reaction. A suite of radiation detectors was used both to detect the presence of irradiated fissionable material and to characterize the probing radiation source. Four types of detectors were used for the source characterization. Thermoluminescent dosimeters were used to measure the angular distribution of the dose associated with x-rays and γ-rays from the ion-beam diode. Plastic scintillator-photodiode detectors were used to characterize the time dependence of this dose. A plastic scintillator-photomultiplier detector was used to monitor the γ-ray intensity of the probing radiation source and to monitor changes in the production of background neutrons by the diode and PTFE converter. A set of rhodium foil activation counters was used to measure the absolute yield of these background neutrons. Two types of detectors with comparable sensitivities were used to measure delayed neutrons resulting from photofission: 3 He proportional counters and a 6 Li-loadedglass-scintillator detector. The neutron detection rate from each detector following the probing radiation pulse was over 100 times higher with depleted uranium present than with lead.

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Section: E Detectors Used To Measure Delayed Neutrons Resulting Frommentioning

confidence: 99%

Section: E Detectors Used To Measure Delayed Neutrons Resulting Frommentioning

confidence: 99%

Section: E Detectors Used To Measure Delayed Neutrons Resulting Frommentioning

confidence: 99%

Section: E Detectors Used To Measure Delayed Neutrons Resulting Frommentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Detectors for intense, pulsed active detection

Jackson

Allen

Apruzese

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

View full text Add to dashboard Cite

show abstract

Development of an intense, pulsed source of combined characteristic-gamma-rays and neutrons to induce fission

Cited by 1 publication

References 2 publications

Detectors for intense, pulsed active detection

Detectors for intense, pulsed active detection

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