Dr. Scott M. Pellegrin Profile

Dr. Scott M. Pellegrin

at Louisiana Tech Univ

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Proceedings Article | 5 May 2010 Paper

Radiation scintillator embedded with a converting medium to detect and discriminate the four species of ionizing radiation

Scott Pellegrin, Chester Wilson

Proceedings Volume 7665, 76651I (2010) https://doi.org/10.1117/12.849950

KEYWORDS: Particles, Scintillators, Sensors, Nanoparticles, Glasses, Lead, Gamma radiation, Absorption, Phase modulation, Head

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A new nanoparticle loaded plastic scintillator embedded in a glass substrate detects and discriminates all species of radiation emitted from fissionable bomb making materials. The fast electron scintillating resin is doped with tailored charge conversion nanoparticles to produce characteristic optical pulses. The created optical pulses exit the detector, since the nanoparticles are appreciably smaller than the wavelength of light. Microsandblasting is used to etch deep cavities in the glass substrate forming independent optical paths. The doped resin is injected into the cavities and cured. A separate off-the-shelf PM tube linearly amplifies the created light pulse into a usable electrical signal. By using tailored nanoparticles, the physical mechanisms for converting different species of radiation into lower energy electrons allows for pulse height spectroscopy to discriminate between alpha, beta, gamma, and neutron radiation. A ⁹⁰Sr source was used to test the beta detector, which is loaded with W. The drop in count rates versus distance was found to be similar to traditional detectors. The gamma detector loaded with Pb nanoparticles was tested with a ⁶⁰Co source. The addition of Pb provided greater sensitivity to the gamma radiation. A ²¹⁰Pl source was used to test the glass doped scintillator. The count rates remained fairly constant for varying distances since alpha particles tend to travel in straight paths until losing most of their initial energy. The ¹⁵⁷Gd loaded scintillator was tested with an Am/Be source. ¹⁵⁷Gd has the largest thermal neutron absorption cross section at 255,000 barns and releases a usable characteristic 72keV electron in 39% of the capture reactions.

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