Time and Energy Resolution of Organic Glass Scintillators for Radionuclide Monitoring

Clark, Leah M.; Maurer, Tessa E.; Marin, Stefano; Giha, Nathan P.; Clarke, Shaun D.; Pozzi, Sara A.

doi:10.1109/nss/mic44867.2021.9875704

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…The centers of the two detectors were 80 cm from the reactor core. Concurrently, we placed two 6-mm cubic detectors, one composed of trans-stilbene (S6E) and one composed of organic glass (O6N) [25], [27] as close as possible to the reactor core. We include the organic glass detector in our measurements due to the rising popularity and availability of organic glass and because trans-stilbene crystal detectors are currently unavailable to purchase from a vendor.…”

Section: Top Wall Of Concrete Shieldmentioning

confidence: 99%

Neutron-Gamma Noise Measurements in a Zero-Power Reactor Using Organic Scintillators

Darby,

Pakari,

Hua

et al. 2024

IEEE Trans. Nucl. Sci.

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Noise measurements in light water reactor systems aid in generating validation data for integral point kinetic parameter predictions and generating monitoring parameters for reactor safety and safeguards. The CROCUS zero-power reactor has been used to support both efforts via measurements with thermal neutron detectors to observe neutron noise and inorganic scintillators to observe gamma noise. The cross-correlation of gamma and neutron noise has been investigated at CROCUS with separate gamma-only and neutron-only detectors. Organic scintillators, sensitive to both neutrons and gamma rays, can be used to cross-correlate gamma-ray and neutron noise with a single detector type. Herein, we present noise measurements using organic scintillators in a light-water, zero-power research reactor for the first time. We discuss data obtained with two 5.08 cm-length by 5.08 cm-diameter cylindrical trans-stilbene detectors and two 6-mm cubic scintillators -one trans-stilbene and one organic glass -set in the water reflector of CROCUS and outside the reactor vessel. The prompt neutron decay constant was estimated to be α CPSD = (154 ± 1) s −1 at 3 mW critical from the (γ,γ) signal, which agrees within one standard deviation overlap with previous measurements with CeBr3 and simulation in Serpent 2. The (n,n) estimate of α CPSD = (145 ± 23) s −1 at 3 mW critical lacked precision but agreed within one standard deviation overlap with previous 235 U fission chamber estimates and simulation in Serpent 2. The 6-mm cubic scintillators were too inefficient to estimate α, but informed possible small-cell, high-volume detection systems to improve the (n,n) estimate capabilities. Based on the high precision estimate of α from the (γ,γ) CPSD signal we suggest the further development of theory to calculate β eff and Λ from gamma-ray noise measurements and recommend gamma noise measurements for future simulation validation and as a method of reactor monitoring.

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Section: Top Wall Of Concrete Shieldmentioning

confidence: 99%

Neutron-Gamma Noise Measurements in a Zero-Power Reactor Using Organic Scintillators

Darby,

Pakari,

Hua

et al. 2024

IEEE Trans. Nucl. Sci.

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“…The 6 mm edge cubes and the 25.4 mm diameter OGS cylinder were connected to Hamamatsu H3178-51 PMTs and the HV of −1200 V was provided by a CAEN DT1470ET unit. Notably, the OGS crystals were cast in-house [54].…”

Section: Organic Scintillator: Organic Glass Scintillator (Ogs)mentioning

confidence: 99%

Gamma-ray Spectroscopy in Low-Power Nuclear Research Reactors

Pakari,

Lucas,

Darby

et al. 2024

JNE

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Gamma-ray spectroscopy is an effective technique for radioactive material characterization, routine inventory verification, nuclear safeguards, health physics, and source search scenarios. Gamma-ray spectrometers typically cannot be operated in the immediate vicinity of nuclear reactors due to their high flux fields and their resulting inability to resolve individual pulses. Low-power reactor facilities offer the possibility to study reactor gamma-ray fields, a domain of experiments hitherto poorly explored. In this work, we present gamma-ray spectroscopy experiments performed with various detectors in two reactors: The EPFL zero-power research reactor CROCUS, and the neutron beam facility at the Ohio State University Research Reactor (OSURR). We employed inorganic scintillators (CeBr3), organic scintillators (trans-stilbene and organic glass), and high-purity germanium semiconductors (HPGe) to cover a range of typical—and new—instruments used in gamma-ray spectroscopy. The aim of this study is to provide a guideline for reactor users regarding detector performance, observed responses, and therefore available information in the reactor photon fields up to 2 MeV. The results indicate several future prospects, such as the online (at criticality) monitoring of fission products (like Xe, I, and La), dual-particle sensitive experiments, and code validation opportunities.

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Time and Energy Resolution of Organic Glass Scintillators for Radionuclide Monitoring

Cited by 2 publications

References 5 publications

Neutron-Gamma Noise Measurements in a Zero-Power Reactor Using Organic Scintillators

Neutron-Gamma Noise Measurements in a Zero-Power Reactor Using Organic Scintillators

Gamma-ray Spectroscopy in Low-Power Nuclear Research Reactors

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