Application of cold-neutron prompt gamma activation analysis at the University of Texas reactor

Wehring, B.W.; Ünlü, Kenan; Ríos-Martínez, C.

doi:10.1016/s0969-8043(97)00129-2

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…Natural hydrogen is composed of 1 H (99.985%) and 2 H (0.015%). Natural carbon is composed of 12 C (98.89%) and 13 C (1.11%). Atomic mass data for hydrogen and carbon isotopes are shown in Table 3.…”

Section: Cold Neutron Prompt Gamma Activation Analysismentioning

confidence: 99%

“…Increased reaction rates are advantageous for PGAA investigations. The UT-NETL uses the Texas Cold Neutron Source [9][10][11][12] to deliver cold neutrons to the PGAA facility [13,14], providing an intense, low-background neutron beam. A typical prompt gamma spectrum for a carbon fiber composite sample is shown in Figure 5.…”

Section: Cold Neutron Prompt Gamma Activation Analysismentioning

confidence: 99%

“…into Equation (2) yields a compound nucleus excitation of 2224.5 keV. The same calculation can be applied to the 12 C(n,)13 C reaction to calculate a compound nucleus excitation of 4946.3 keV. Nuclear energy level diagrams for the 2 H and13 C compound nuclei are shown in Figures2 and 3respectively.…”

mentioning

confidence: 94%

“…The same calculation can be applied to the 12 C(n,)13 C reaction to calculate a compound nucleus excitation of 4946.3 keV. Nuclear energy level diagrams for the 2 H and13 C compound nuclei are shown in Figures2 and 3respectively. Protons and neutrons in the atomic nuclei conform to strict energy levels much like electrons in atomic orbitals.…”

mentioning

confidence: 99%

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Non-Destructive Evaluation of Carbon Fiber Composite Reinforcement Content

Dorsey

Hebner

Charlton

2004

Journal of Composite Materials

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The use of light-weight, high-strength composite materials in motors, generators, and energy storage devices has become common as a means to maximize energy density. To ensure reliability, non-destructive and destructive evaluation techniques have been employed to measure the mechanical properties of fabricated components. In carbon fiber-reinforced, polymer matrix composites, mechanical strength is primarily derived from the fiber volume fraction. Due to the lack of a nondestructive method, common techniques for fiber volume determination are currently destructive. In this investigation, a non-destructive method for the measurement of the fiber volume fraction of carbon fiber-reinforced, polymer matrix composites has been developed using cold neutron prompt gamma activation analysis (PGAA). Fiber volume determination is accomplished in this technique by measuring and comparing the carbon and hydrogen content in a given sample (or samples). PGAA is a nuclear analytical technique performed by exposing a sample to neutron radiation. PGAA measurements are non-destructive and can be performed without chemical preparation of the sample. Fiber volumes of several composite coupons have been determined relative to standard samples of known fiber volume and measurements are in good agreement with values predicted by acid digestion tests. Fiber volume measurement using PGAA can potentially be applied to any composite material where the contents of the matrix and reinforcement differ. The technique can also be spatially sensitive, with resolution limited by the dimensions of the neutron beam that is used.

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Section: Cold Neutron Prompt Gamma Activation Analysismentioning

confidence: 99%

Section: Cold Neutron Prompt Gamma Activation Analysismentioning

confidence: 99%

mentioning

confidence: 94%

mentioning

confidence: 99%

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Non-Destructive Evaluation of Carbon Fiber Composite Reinforcement Content

Dorsey

Hebner

Charlton

2004

Journal of Composite Materials

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“…A set of different sample holders are available for different measurements: the samples can be put in Teflon 1 vials on Teflon supports, or affixed among Teflon strings tied to aluminum or Teflon frames, similarly to other PGAA facilities worldwide [3,9].…”

Section: Introductionmentioning

confidence: 99%

Construction and characterization of the redesigned PGAA facility at The University of Texas at Austin

Révay

Harrison

Alvarez

et al. 2007

Nuclear Instruments and Methods in Physics Research Section A:

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Prompt γ‐Neutron Activation Analysis

Oliveira

Salgado

Carvalho

2000

Encyclopedia of Analytical Chemistry

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Prompt γ‐neutron activation analysis (PGNAA) is a multielemental analytical technique based on the detection of γ‐rays emitted by excited nuclei following neutron radioactive capture or neutron inelastic scattering. The accumulated count rate relative to the γ‐ray energy characteristic of a certain isotope depends on its concentration. Measurements take place during sample irradiation. The technique can provide accurate information on the elemental composition of materials in a broad range of cases: raw materials, mineral exploration, contaminants, detection of forbidden products, such as drugs and explosives, inspection of containers and applications in health care. Among the main advantages of the PGNAA technique are: faster results; nondestructiveness; flexible sample requirements; bulk sample analysis; in situ application by direct on‐line measurement; detectable unique signatures for most elements; improved accuracy for short‐lived elements; low residual activity. On the other hand, the most significant limitations are: higher detection limits (DLs) as compared with delayed γ‐neutron activation analysis (DGNAA); longer irradiation times; single (one‐cycle) sample irradiation; impracticability of enhancing a specific isotope contribution by radiochemical or physical (half‐life) separation techniques; requirement for relatively larger samples.

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Application of cold-neutron prompt gamma activation analysis at the University of Texas reactor

Cited by 9 publications

References 4 publications

Non-Destructive Evaluation of Carbon Fiber Composite Reinforcement Content

Non-Destructive Evaluation of Carbon Fiber Composite Reinforcement Content

Construction and characterization of the redesigned PGAA facility at The University of Texas at Austin

Prompt γ‐Neutron Activation Analysis

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