Design of a large irradiation channel at MNSR facility in Ghana

Nyarko, B.J.B.; Asamoah, Moses Kumi; Gyampo, O.; Akaho, E.H.K.; Yamoah, S.; Mensimah, E.; Abrefah, R.G.

doi:10.1016/j.anucene.2010.09.023

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Masses up to tens of grams may be irradiated using existing pneumatic transfer systems. For the analysis of larger objects (up to the (multi) kilogram range) facilities have been developed in the thermal columns of the reactor [14,34] (Figure 2), in its pool [35], or in external neutron beams [36,37], and dedicated neutron beams have been used for large-sample PGAA [38,39]. An overview of some operational large-sample NAA facilities for research reactors is given in Table 1.…”

Section: Methods and Conceptsmentioning

confidence: 99%

Kilogram Sample Analysis by Nuclear Analytical Techniques: Complementary Opportunities for the Mineral and Geosciences

Bode¹

2021

Minerals

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Sample-size reduction including homogenization is often required to obtain a test portion for element compositional analysis. Analyses of replicate test portions may provide insight into the sampling constant, and often much larger quantities are needed to limit the contribution of sampling error. In addition, it cannot be demonstrated that the finally obtained test portion is truly representative of the originally collected material. Nuclear analytical techniques such as neutron and photon activation analysis and (neutron-induced) prompt gamma activation analyses can now be used to study and overcome these analytical problems. These techniques are capable of obtaining multi-element measurements from irregularly shaped objects with masses ranging from multiple grams to multiple kilograms. Prompt gamma analysis can be combined with neutron tomography, resulting in position-sensitive information. The analysis of large samples provides unprecedented complementary opportunities for the mineral and geosciences. It enables the experimental assessment of the representativeness of test portions of the originally collected material, as well as the analysis of samples that are not allowed to be sub-sampled or dissolved, the analysis of materials that are difficult to be homogenized at large, and studies on the location of inhomogeneities. Examples of such applications of large-sample analyses are described herein.

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Section: Methods and Conceptsmentioning

confidence: 99%

Kilogram Sample Analysis by Nuclear Analytical Techniques: Complementary Opportunities for the Mineral and Geosciences

Bode¹

2021

Minerals

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“…Nyarko et al . () describe the design and feasibility of a large‐sample irradiation site for a low‐flux reactor, and Haddad and Alsomel () examine and demonstrate LS‐INAA of waste products (ash, municipal waste and sewage) for the determination of Sb, Hg, Co, Zn, As, Cs, Sm, K, Sc, Ti, Mn and Br using photoneutrons generated by the interaction of high‐energy gamma rays emitted by fission products with the reactor Be reflector when the reactor is shutdown (subcritical).…”

Section: Instrumental Neutron Activation Analysis (Contribution By Mmentioning

confidence: 99%

GGR Biennial Critical Review: Analytical Developments Since 2010

Wiedenbeck

Bugoi

Duke

et al. 2012

Geostandard Geoanalytic Res

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Advances in the chemical and isotopic characterisation of geological and environmental materials can often be ascribed to technological improvements in analytical hardware. Equally, the creation of novel methods of data acquisition and interpretation, including access to better reference materials, can also be crucial components enabling important breakthroughs. This biennial review highlights key advances in either instrumentation or data acquisition and treatment, which have appeared since January 2010. This review is based on the assessments by scientists prominent in each of the given analytical fields; it is not intended as an exhaustive summary, but rather provides insight from experts of the most significant advances and trends in their given field of expertise. In contrast to earlier reviews, this presentation has been formulated into a unified work, providing a single source covering a broad spectrum of geoanalytical techniques. Additionally, some themes that were not previously emphasised, in particular thermal ionisation mass spectrometry, accelerator‐based methods and vibrational spectroscopy, are also presented in detail.

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