scholarly journals An analysis of geochemical features of crystallization of emeralds as an approach to determine the deposit of them

2021 ◽  
pp. 16-21
Author(s):  
POPOV Мikhail Petrovich ◽  
◽  
SOLOMONOV Vladimir Ivanovich ◽  
SPIRINA Аl’fiya Vilikovna ◽  
IVANOV Мikhail Alekseevich ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Alkali Metals ◽  
Additional Method ◽  
Impurity Composition ◽  
X Ray ◽  
Fluorescent Analysis ◽  
Impurity Elements ◽  
The Relationship ◽  
Non Destructive ◽  
Main Impurity

Relevance. It is known that minerals differ in morphology, features of the internal structure of crystals, chemical composition, etc., depending on the conditions of their formation and existence. These geochemical features of the gems crystallization are an important criterion for determining their deposit. In this paper, the impurity composition of the samples of emeralds from the deposits of Brazil, China, Zambia, Russia, Afghanistan, Colombia, and Tanzania was investigated by X-ray fluorescent analysis. The study of the impurity composition of emeralds by a non-destructive method and the construction of analytical dependences can be used as an additional way for determining the deposit of emeralds. Purpose of the work is the study of chemical composition of emeralds by X-ray fluorescent analysis to establish the relationship between the content of the main impurity elements and the deposit. Results. The data on the impurity composition of emeralds obtained by X-ray fluorescent analysis show that the content of impurities of Na, K, Rb, Cs, Mg, Fe, V, Cr differs from one deposit to another. The content of impurities of alkali metals and magnesium is higher in the samples from the shale-type deposits compared to the samples from deposits of the Colombian type. Thus, at the first stage, the type of deposit can be assumed. Further, the dependences plotted in the coordinate planes {Cr, V}, {Cs, Cr}, {Fe, Cr} show separate areas, delimited by the impurity ratios, which are typical for the samples from deposits in China, Colombia, Zambia, Afghanistan, and Tanzania. Conclusion. X-ray fluorescent analysis, as a non-destructive method for studying emeralds, is considered to be a promising approach to identifying their deposit, but as an additional method.

scholarly journals Preventing the Sale of Fraudulent Gemstones using Non-Destructive X-Ray Fluoresence Spectroscopy

2009 ◽  
Vol 17 (1) ◽  
pp. 52-55
Author(s):  
Mary S. Goldman ◽  
Dan L. Davis ◽  
Robert H. Clifford
Keyword(s):  
Chemical Composition ◽  
Significant Role ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
X Ray ◽  
Naked Eye ◽  
The World ◽  
Non Destructive ◽  
Ideal Technique ◽  
Xrf Spectroscopy

As the old adage goes, beauty is in the eye of the beholder. Ultimately, in the world of jewelry, the unwitting buyer uses his or her naked eye to decide which baubles are the most beautiful and worthy of wear. The expert jeweler and gemologist, however, know that each gem is subjected to rigorous scientific examinations and standards to determine its value and authenticity.As the number of methods for altering gems grows with technology, methods to counteract counterfeiters, who can take a worthless stone and alter it to make it appear like a more expensive gem, are essential to gem buyers and traders. They must be able to detect artificial stones.Gemologists assess gemstones based on several standards such as chemical composition and purity. Chemical composition plays a significant role in evaluating gems, as two of the same gemstone can differ chemically. One of the most well known methods of non-destructive testing for detecting gem quality is X-ray fluorescence (XRF) spectroscopy. Increasingly in demand, XRF spectroscopy is an ideal technique for fighting the battle against fraud.

scholarly journals XRF Analysis of Carica papaya Leaves of Semi Arid Region of Kachchh

2014 ◽  
Vol 24 ◽  
pp. 15-24
Author(s):  
Pravin N. Ram ◽  
Vijay Ram ◽  
Taslimahemad T. Khatri ◽  
Suhas J. Vyas ◽  
Pragnesh N. Dave
Keyword(s):  
Trace Elements ◽  
Chemical Composition ◽  
Arid Region ◽  
Carica Papaya ◽  
Major And Trace Elements ◽  
X Ray ◽  
Vanadium Titanium ◽  
Semi Arid Region ◽  
Non Destructive ◽  
Semi Arid

The objective of the present investigation was to study the chemical composition of leaves of Carica papaya belonging to family Caricaceae growing in semi-arid region of Kachchh district, Gujarat, India. The leaves of C. papaya were subjected to Energy Dispersive X-ray Fluorescence (EDXRF) and were analyzed for different mineral composition. As the X-ray Fluorescence is one of the most reliable and accurate, as well as it is also a consistent and non-destructive method for analysis of major and trace elements using a single pressed pellet. During the study it was found that Oxygen, Calcium, Magnessium, Potassium were noted in higher amounts, compared to that of other elements like Silicon, Sulphur, Phosphorus, Chloride, Strontium, Stanous, Aluminium, Cromium and Mangenese, whereas the elements which were not detected in leaves of C. papaya are Vanadium, Titanium, Cobalt and Tantalum.

X-Ray Diffraction Study of Cold Sprayed Ni-20Cr and Ni-50Cr Coatings on Boiler

2012 ◽  
Vol 620 ◽  
pp. 257-262 ◽  
Author(s):  
Niraj Bala ◽  
Harpreet Singh ◽  
Satya Prakash
Keyword(s):  
Chemical Composition ◽  
Xrd Analysis ◽  
Crystallographic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Study ◽  
Non Destructive ◽  
Sprayed Coatings ◽  
Boiler Steels ◽  
Better Than

X-ray diffraction (XRD) is a versatile, non-destructive technique that reveals detailed information about the chemical composition and crystallographic structure of materials. In this work Ni-20Cr and Ni-50Cr coatings were deposited on two boiler steels namely T22 and SA 516 steel. The measurement of residual stresses of these cold sprayed coatings was done with the help of X-ray diffraction technique. This paper discussed the XRD study of the as-sprayed coatings. Further the XRD technique was used to study the uncoated and coated steels after cyclic exposure to air, molten salt [Na2SO4-60%V2O5], and actual boiler environments. The results obtained from the XRD analysis have been shown. The weight change results showed that the coated steels performed better than their uncoated counterparts which might be attributed to the formation of protective phases.

X-ray microtomography study of otic capsule deficiencies: three-dimensional modelling of the fissula ante fenestram

2015 ◽  
Vol 129 (9) ◽  
pp. 840-851 ◽  
Author(s):  
J W Lee ◽  
P Sale ◽  
N P Patel
Keyword(s):  
Inner Ear ◽  
Three Dimensional ◽  
Oval Window ◽  
Otic Capsule ◽  
X Ray ◽  
Otologic Surgery ◽  
Science Group ◽  
Temporal Bones ◽  
The Relationship ◽  
Non Destructive

AbstractBackground:The postulated sites of perilymph fistulae involve otic capsule deficiencies, in particular, at the fissula ante fenestram. Histological studies have revealed this to be a channel extending from the middle ear, and becoming continuous with the inner ear medial to the anterior limit of the oval window. The relationship between a patent fissula and symptoms of perilymph fistula is contentious.Objective:The understanding of the anatomy of the fissula ante fenestram is incomplete. Histopathology is inherently destructive to the delicate ultrastructure of the middle and inner ear. Conversely, X-ray microtomography allows non-destructive examination of the otic capsule. In this study, we used X-ray microtomography to characterise the fissula ante fenestram.Materials and methods:We imaged cadaveric temporal bones with X-ray microtomography. We used the Avizo Fire (Visualization Science Group, Merignac Cedex, France) software to perform post-processing and image analysis.Results:Three-dimensional modelling of the fissula ante fenestram allowed stratification into four forms: rudimentary pit; partial fissula; complete occluded fissula; and complete patent fissula.Conclusion:X-ray microtomography showed that the fissula ante fenestram is present in various forms from rudimentary pit to complete deficiency of the otic capsule. This understanding may have implications for otologic surgery and clinical diagnosis of perilymph fistula.

Lithium tourmalines from the Meldon aplite, Devonshire, England

1976 ◽  
Vol 40 (315) ◽  
pp. 747-751 ◽  
Author(s):  
M. N. Chaudhry ◽  
R. A. Howie
Keyword(s):  
Chemical Composition ◽  
Refractive Indices ◽  
Chemical Analyses ◽  
Linear Variation ◽  
X Ray ◽  
Cell Parameters ◽  
The Relationship

SummarySeven chemical analyses of pink or green tourmalines belonging to the elbalte-schorl series, along with their physical, optical, and X-ray data are presented. Linear variation diagrams showing the relationship between composition and refractive indices, specific gravities, and cell parameters are constructed. Relationship between colour and chemical composition is also discussed.

scholarly journals X-ray Technology to Determine Peanut Maturity1

2020 ◽  
Vol 47 (2) ◽  
pp. 38-45
Author(s):  
R.B. Sorensen ◽  
C.L. Butts ◽  
M.C. Lamb
Keyword(s):  
Linear Response ◽  
Background Color ◽  
Current Standard ◽  
Economic Return ◽  
X Ray ◽  
Arachis Hypogaea L ◽  
Power Detector ◽  
Maturity Class ◽  
The Relationship ◽  
Non Destructive

ABSTRACT Indeterminate growth of peanut (Arachis hypogaea L.) creates indecision for best digging date for maturity and economic return. The current standard to determine peanut maturity is the Hull Scrape method. This method uses human observations to place hull scraped peanuts on a color maturity profile board. Human observations may lack precision and repeatability from individual to individual. X-ray technology has the capability of viewing peanut kernels through the hull to possibly ascertain density and maturity. The objective was to determine if x-ray could be used as a quick, non-destructive, and repeatable method to determine peanut maturity of runner, spanish, and virginia market types. Fresh dug peanut pods had 25 percent greater peanut area and gray scale values compared with hull scraped pods (runner and virginia only) and showed no difference in x-ray value between immature and fully mature peanut. Dried peanut showed a linear response of x-ray value versus peanut maturity (hull color). Virginia market type had much higher x-ray values followed by runners, then spanish. The relationship between peanut maturity and x-ray value peaked at the Orange class for runners (Georgia-06G, Georgia-13M), and Spanish (AT9899) while virginia (Georgia-11J) tended to peak at the Brown class. This research demonstrated that x-ray technology may be used to measure peanut density and possible maturity but needs further examination past Orange and Brown maturity class. Final x-ray values determined by this proprietary x-ray equipment may not be transferable due to specific x-ray power, detector precision, background color/scatter, and other electronic nuances.

Accuracy of dual energy X-ray absorptiometry, weight, longissimus lumborum muscle depth and GR fat depth to predict half carcass composition in sheep

2007 ◽  
Vol 47 (10) ◽  
pp. 1165 ◽  
Author(s):  
F. R. Dunshea ◽  
D. Suster ◽  
P. J. Eason ◽  
R. D. Warner ◽  
D. L. Hopkins ◽  
...  
Keyword(s):  
Mineral Content ◽  
Dual Energy ◽  
Carcass Composition ◽  
Regression Equations ◽  
Tissue Mass ◽  
X Ray ◽  
Longissimus Lumborum ◽  
The Relationship ◽  
Non Destructive ◽  
Total Tissue

A Hologic QDR4500W dual energy X-ray absorptiometer (DXA) was used to measure body composition in 60 sheep half carcasses ranging from 8 to 28 kg. Half carcasses were from ewes and wethers of mixed genetics. Values determined by DXA, including total tissue mass (TTM), lean tissue mass (LTM), fat tissue mass (FTM) and bone mineral content (BMC), for the half carcass were evaluated by comparison with chemically determined composition. In the case of BMC, the relationship was with chemically determined ash content. Liveweight and chemically determined lean, fat and ash were strongly related to DXA-derived values for TTM, LTM, FTM and BMC, respectively (R2 = 0.999, 0.986, 0.989 and 0.920, respectively). However, because DXA estimates were different from chemically determined values in this sample of carcasses, they needed to be adjusted with the use of appropriate regression equations to correct the in-built algorithms. These data demonstrate the efficacy of DXA as a non-destructive method for determining the composition of the sheep half carcass.

scholarly journals Study of the chemical composition of Amir Wali coins by x-ray fluorescent analysis

2021 ◽  
Vol 4 (5) ◽  
pp. 1238-1249
Author(s):  
Alexey N. Alyoshin
Keyword(s):  
Trace Elements ◽  
Chemical Composition ◽  
Raw Material ◽  
Basic Composition ◽  
X Ray ◽  
Fluorescent Analysis ◽  
Quantitative Content ◽  
The City

The chemical composition of seven coins of Amir Wali of six dirhams par value (two types) minted in Astarabad in 769 and 75 Hijri (1368 and 1374 AD) was studied by x-ray fluorescent analysis using a portable TRACER 5i spectrometer. There were established the basic composition of the coin alloy and the quantitative content of the trace elements. The performed comparison with the coin alloys compositions of the preceding dynasties demonstrated continuity of minting technologies and similarity of ore sources used in the production of dirhams during the reign of Amir Wali in Astarabad. Based on the literary data of galenic ores composition mined in the Zenjan province, it is suggested that the raw material for coin mintage was extracted from a deposit located near the city of Damgan.

scholarly journals Non-Destructive In Situ Investigation of the Study of a Medieval Copper Alloy Door in Canosa di Puglia (Southern Italy)

Heritage ◽  
2022 ◽  
Vol 5 (1) ◽  
pp. 145-156
Author(s):  
Giovanni Buccolieri ◽  
Alfredo Castellano ◽  
Vito Nicola Iacobelli ◽  
Giorgio Giuseppe Carbone ◽  
Antonio Serra ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Copper Alloy ◽  
Southern Italy ◽  
The Other ◽  
X Ray ◽  
In Situ Investigation ◽  
The University ◽  
Non Destructive ◽  
Made In

This paper reports the analyses carried out on the medieval copper alloy door (1111–1118 AD) of the mausoleum of Boemondo d’Altavilla in Canosa di Puglia (Southern Italy). The studied door is the smallest medieval bronze door extant in Italy and, unlike the other Byzantine doors, was most probably made in Canosa di Puglia and not in Constantinople. Analyses were performed to assess the chemical composition of the alloy patinas using a portable energy dispersive X-ray fluorescence (ED-XRF) instrument designed at the University of Salento. The experimental results suggested that the two door leaves have the same chemical composition, even if they appear different in both style and size. Furthermore, the alloy used for the door is different from the other previously-analyzed Byzantine bronze doors. The obtained results can be used in the future to compare the chemical composition of other Byzantine doors in order to better understand the manufacture of these precious artifacts.

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