Institute Of Nuclear Sciences Research Articles

Average cross-sections for ( n, p) and ( n, α) reactions on 19F and 23Na in a fission neutron spectrum

The average cross-sections for the ( n, p) and ( n, α) reactions on 19F and 23Na in a 235U thermal fission neutron spectrum were determined by radioactivation. Calcium fluoride and sodium carbonate samples and an aluminum fast neutron flux monitor were irradiated in the Thetis reactor (Institute for Nuclear Sciences, Rijksuniversiteit Gent). The activities induced by the reactions of interest were measured with a detector of calibrated detection efficiency. Using σ F = 0.705 mb for the 27Al( n, α) 24Na monitor reaction, the following cross-sections were obtained: 19F( n, p) 19O: 0.83 ± 0.02 mb; 19F( n, α) 16N: 15.1 ± 0.2 mb; 23Na( n, p) 23Ne: 1.43 ± 0.02 mb and 23Na( n, α) 20F: 0.53 ± 0.02 mb. The results are compared with other experimental and evaluated data found in the literature.

High temperature anomalous behaviour of the crystal lattice of hematite

physica status solidi (a)Volume 41, Issue 2 p. K133-K136 Short Note High temperature anomalous behaviour of the crystal lattice of hematite N. B. Nešković, N. B. Nešković Institute of Nuclear Sciences “Boris Kidrič”, Vinča, Beograd, P.O. Box 522, 11001 Beograd, YugoslaviaSearch for more papers by this authorB. Babić, B. Babić Institute of Nuclear Sciences “Boris Kidrič”, Vinča, Beograd, P.O. Box 522, 11001 Beograd, YugoslaviaSearch for more papers by this authorJ. Konstantinović, J. Konstantinović Institute of Nuclear Sciences “Boris Kidrič”, Vinča, Beograd, P.O. Box 522, 11001 Beograd, YugoslaviaSearch for more papers by this author N. B. Nešković, N. B. Nešković Institute of Nuclear Sciences “Boris Kidrič”, Vinča, Beograd, P.O. Box 522, 11001 Beograd, YugoslaviaSearch for more papers by this authorB. Babić, B. Babić Institute of Nuclear Sciences “Boris Kidrič”, Vinča, Beograd, P.O. Box 522, 11001 Beograd, YugoslaviaSearch for more papers by this authorJ. Konstantinović, J. Konstantinović Institute of Nuclear Sciences “Boris Kidrič”, Vinča, Beograd, P.O. Box 522, 11001 Beograd, YugoslaviaSearch for more papers by this author First published: 16 June 1977 https://doi.org/10.1002/pssa.2210410252Citations: 5AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume41, Issue216 June 1977Pages K133-K136 RelatedInformation

Isotope work applied to geothermal systems at the institute of nuclear sciences, New Zealand

A number of isotope techniques are being applied to the study of the New Zealand geothermal areas. Stable isotope equilibria have been used to estimate temperature profiles underground. Present results indicate that the hydrogen-water and sulphate-water ( 18O) equilibria represent temperatures close to the surface, while the 13CO 2 12CH 4 and H 34 SO 4 − H 2 32 S equilibria are much slower to re-establish and probably represent temperatures at greater depth. Dating by natural radioactive carbon-14 and tritium techniques have so far only been able to show that the water circulation times are greater than 20 yr. Hydrogen and oxygen-18 measurements indicate that the geothermal waters originate mainly from local groundwaters but may have undergone varying oxygen shifts by reaction with rocks in the system. Ore bodies in the Tertiary volcanics of New Zealand are being studied as indicators of past geothermal conditions.

New Zealand potassium-argon age list—2

Abstract Developments and modifications to potassium-argon dating methods at the Institute of Nuclear Sciences are described. Potassium is extracted from rocks by ion-exchange separation from other elements and analysed flame spectrophotometrically against potassium hydrogen phthalate standard solutions. Argon is extracted from rocks by RF induction heating and purified by passing over liquid nitrogen cold traps and heated titanium. Argon concentrations are assessed by a 38Ar isotope dilution/mass spectrometric method, which has previously been calibrated against the primary atmospheric argon standard and secondary international rock standards. Analytical data are summarised for 84 potassium-argon age determinations produced in the period 1971–73 and are cross-referenced against published reports. The majority of the ages presented relate to projects investigating: (a) Pliocene—Upper Miocene hydrothermal alteration in Lower Miocene volmnics in the Coromandel Peninsula; (b) Ordovician metamorphism of slate...

Average cross-sections for (n, p) reactions on calcium in a fission-type reactor spectrum

The average cross-section in a fission-type reactor spectrum\(\bar \sigma _F\) was experimentally determined for the reactions42Ca(n, p)42K,43Ca(n, p)43K and44Ca(n, p)44K. Calcium carbonate samples and fast neutron flux monitors were irradiated with and without cadmium shielding in the Thetis reactor (Institute for Nuclear Sciences, Rijksuniversiteit, Gent). The potassium activities induced in the calcium carbonate samples were separated and purified by tetraphenylborate precipitation, after which they were measured with a Ge(Li)-detector of calibrated detection efficiency. On the basis of\(\bar \sigma _F = 0.64\) mb for the reaction27Al(n, α)24Na, the average cross-sections were as follows:42Ca(n, p)42K: 2.82±0.07mb;43Ca(n, p)43K: 1.89±0.05 mb;44Ca(n, p)44Ca(n, p)44K: 0.065±0.003 mb.

Ucr Radiocarbon Dates I

A radiocarbon facility has been installed at the University of California, Riverside (UCR) to support interdisciplinary studies including archaeologic, archaeometric, geophysical, and geologic research. The laboratory was built between 1970 and 1973. Initially, a sample pretreatment and combustion system designed for a proportional CO2 counting system was installed. It was designed after concepts developed at the University of California Los Angeles (UCLA) and New Zealand (Institute of Nuclear Sciences) Laboratories, and began processing samples in November 1972.

Xenon ion ranges in copper single crystals

physica status solidi (a)Volume 18, Issue 2 p. K73-K76 Short Note Xenon ion ranges in copper single crystals T. Jokić, T. Jokić Ion Physics Laboratory, Institute of Nuclear Sciences, BelgradeSearch for more papers by this authorB. Perović, B. Perović Ion Physics Laboratory, Institute of Nuclear Sciences, BelgradeSearch for more papers by this author T. Jokić, T. Jokić Ion Physics Laboratory, Institute of Nuclear Sciences, BelgradeSearch for more papers by this authorB. Perović, B. Perović Ion Physics Laboratory, Institute of Nuclear Sciences, BelgradeSearch for more papers by this author First published: 16 August 1973 https://doi.org/10.1002/pssa.2210180242Citations: 1AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume18, Issue216 August 1973Pages K73-K76 RelatedInformation

A search for chromosome translocations induced by cysteamine and AET Cl HCl in spermatogonia of irradiated mouse : Savkovic, N., and J. Pecevski, Institute of Nuclear Sciences “Boris Kidric”, Radiobiological Laboratory, Beograd (Yougoslavia)

A search for chromosome translocations induced by cysteamine and AET Cl HCl in spermatogonia of irradiated mouse : Savkovic, N., and J. Pecevski, Institute of Nuclear Sciences “Boris Kidric”, Radiobiological Laboratory, Beograd (Yougoslavia)

New Zealand potassium-argon age list—1

Abstract The methods used at the Institute of Nuclear Sciences for the dating of rocks by the potassium argon technique are described. The potassium content of the rock is measured by flame photometry, the radiogenic argon content is determined by 38Ar isotope dilution following vacuum extraction and the isotopic ratios measured on a Nier type mass spectrometer using digital recording and analysis techniques. The system has been calibrated both absolutely and with respect to interlaboratory standard minerals and agreement within 0.8% (S.D.) obtained. The potassium argon ages of 25 new samples from New Zealand and Antarctica are reported. In 14 samples, more than one fraction of the sample has been dated. A list of all known previously published radiometric dates for samples from New Zealand territories is given.

Solubility of sodium in germanium

physica status solidi (a)Volume 10, Issue 2 p. K119-K120 Short Note Solubility of sodium in germanium V. Spirić, V. Spirić Institute of Nuclear Sciences “Boris Kidrič”, BeogradSearch for more papers by this authorM. Stojić, M. Stojić Institute of Nuclear Sciences “Boris Kidrič”, BeogradSearch for more papers by this author V. Spirić, V. Spirić Institute of Nuclear Sciences “Boris Kidrič”, BeogradSearch for more papers by this authorM. Stojić, M. Stojić Institute of Nuclear Sciences “Boris Kidrič”, BeogradSearch for more papers by this author First published: 16 April 1972 https://doi.org/10.1002/pssa.2210100242Citations: 3AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article.Citing Literature Volume10, Issue216 April 1972Pages K119-K120 RelatedInformation

Neutron Activation Analysis of Human Hair Collected at Regular Intervals for 25 years

A study was made of the trace elements (Au, Hg, Cu, As, Sb, Mn and Zn) present in the hair of two brothers, the samples having been obtained over a period of about 29 years. The elements were activated by neutron irradiation and detected by means of their γ emitting radioisotopes. The results obtained, were analysed to see how the concentration of the elements varied with time, and also to compare the values obtained for the two brothers, with a view to using this technique as a means of identifying a person by means of their hair. This work was performed in the Institute of Nuclear Sciences, University of Ghent, Belgium, under the direction of Professor Dr. J. Hoste and of Professor F. Thomas, M.D., Director of the Laboratory of Legal Medicine and Criminalistics, University of Ghent, Belgium.

Analysis of Radioisotope Thickness Gauge as a Regulation System Subassembly

The radioisotope thickness gauge developed at the “Boris Kidric” Institute of Nuclear Sciences- Vinca is applied in industrial plants as a sensing device of the thickness regulation system. The paper gives an analysis of transfer functions of the thickness gauge IMD-4 modified to fit the system for copper strips cold rolling process control in the thickness range of 0.1…3 mm.

Dosimetric Intercomparison Measurements in the Core of Reactor ISIS at Saclay

Dosimetric intercomparison in the core of the ISIS reactor is performed using two different types of calorimeters: a pedestal differential device designed at CEN Saclay (France) and a heat-flow calorimeter designed at the Boris Kidric Institute of Nuclear Sciences (Yugoslavia). The results obtained in graphite and polyethylene as reference materials are intercompared for both types of calorimeters and an agreement within a few per cent obtained. From the neutron measurements, the neutron dose rates are calculated and compared to the values derived from calorimetry; the agreement within 15% is obtained. Several chemical dosimetric systems (i.e., oxalic acid dissolved in light and heavy water, solid oxalic, malonic, and succinic acid) were irradiated and the curves of dose effect obtained.

Derivation of the change of state in measurement from the concept of minimal measurement: Fedor Herbut. Institute of Nuclear Sciences, “Boris Kidric”, Vinca Beograd, Yugoslavia

Derivation of the change of state in measurement from the concept of minimal measurement: Fedor Herbut. Institute of Nuclear Sciences, “Boris Kidric”, Vinca Beograd, Yugoslavia

The Institute for Nuclear Sciences, Ghent University, Ghent, Belgium

The Institute for Nuclear Sciences, Ghent University, Ghent, Belgium

Aquatic Bryophytes as Indicators of Uranium Mineralization

Aquatic Bryophytes as Indicators of Uranium Mineralization

New Zealand, Institute of Nuclear Science

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Crack nucleation in magnesium oxide Bi-crystals

Abstract The financial support for the work was provided by the Australian Institute of Nuclear Science and Engineering. The author is indebted to Professor H. W. Worner for taking an active interest in the work and arranging the use of facilities in the Baillieu Laboratory.

The Cento Institute of Nuclear Science in Tehran

The Cento Institute of Nuclear Science in Tehran