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Berry, R.L.
Troxler Electronic Labs., Inc., Raleigh, NC (USA)1979
Troxler Electronic Labs., Inc., Raleigh, NC (USA)1979
AbstractAbstract
[en] A calibration standard for thermal neutron moisture gauges is claimed. It comprises a hydrophobic body formed of a moderating material containing hydrogen in its molecular structure and a substantially non-moderating material. The materials are arranged so that there is a uniform distribution of moderating material throughout the body in order to impart physical characteristics which are effective for representing a mass of homogenous hydrogen content to a nuclear gauge undergoing calibration
Primary Subject
Secondary Subject
Source
26 Apr 1979; vp; AU PATENT DOCUMENT 77/29892/B/; Copies available from the Commissioner of Patents, Canberra; Filed 20 Oct 1977, accepted 9 Oct 1980, priority 21 Oct 1976 (US734624).
Record Type
Patent
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Grasty, R.L.; Bristow, Q.; Cameron, G.W.; Dyck, W.; Grant, J.A.; Killeen, P.G.
Proceedings of the symposium on uranium exploration methods1982
Proceedings of the symposium on uranium exploration methods1982
AbstractAbstract
[en] This paper describes how primary potassium, uranium and thorium standards can be prepared from potassium carbonate, radium chloride and from a thorium salt, manufactured in 1906, which has now reached radioactive equilibrium. Experiments utilizing prepared potassium and thorium samples of different density show how the calibrated constants derived from the primary standards can be modified to allow samples of different densities to be measured reliably
Source
Nuclear Energy Agency, 75 - Paris (France); 979 p; ISBN 92-64-02350-X;
; 1982; p. 699-712; OECD; Paris (France); Symposium on uranium exploration methods; Paris (France); 1-4 Jun 1982

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Conference
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AbstractAbstract
[en] To establish a coherent system of metrological references it is necessary in particular to define and employ transfer methods so that the knowledge can be reflected with minimum loss. In the field of ionizing radiation dosimetry it was necessary after the roentgen which is the unit of exposure, to develop transfer methods for the rad, absorbed dose unit. Without excluding other possibilities the method adopted is based on the use of the ferrous sulphate dosimeter, for standardized dosimetric conditions (geometry, medium) and in the users'own beams. The metrological characteristics of the ferrous sulphate dosimeter, were studied beforehand, especially the conservation of data in time and the yield G as a function of energy. The method proposed leads to the water-absorbed dose calibration of the user's dosimeter in his own beam, for X or γ photons of energies between about 0.5 and 1.5 MeV; for higher-energy photons and for 10 to 35 MeV electrons the same procedure is applicable as long as certain conventions (measurement depths and yield G of the transfer dosimeter) are adopted temporarily
[fr]
L'etablissement d'un systeme coherent de references metrologiques necessite, en particulier, la definition et la mise en oeuvre de methodes de transfert qui doivent permettre de repercuter la connaissance avec un minimum de pertes. Dans le domaine de la dosimetrie des rayonnements ionisants, apres la realisation du transfert du roentgen, unite d'exposition, il convenait de realiser le transfert du rad, unite de dose absorbee. Sans exclure d'autres possibilites, la methode retenue est basee sur l'emploi du dosimetre au sulfate ferreux, pour des conditions dosimetriques normalisees (geometrie, milieu) et dans les propres faisceaux des utilisateurs. Les caracteristiques metrologiques du dosimetre au sulfate ferreux ont ete prealablement etudiees, en particulier la conservation de l'information dans le temps et le rendement G en fonction de l'energie. La procedure proposee aboutit a l'etalonnage en dose absorbee dans l'eau du dosimetre de l'utilisateur dans son propre faisceau, pour les photons X ou γ d'energies comprises entre environ 0,5 et 1,5 MeV; pour les photons d'energies superieures et pour les electrons d'energies comprises entre 10 et 35 MeV, la meme procedure est applicable, moyennant l'adoption, a titre transitoire, de certaines conventions (profondeurs de mesure et rendement G du dosimetre de transfert)Original Title
Transfert de l'unite de dose absorbee a l'aide du dosimetre au sulfate ferreux
Primary Subject
Source
Societe Francaise de Radioprotection, 92 - Montrouge; p. 683-701; 1976; Societe Francaise de Radioprotection; Montrouge, France; 8. International congress of the French Society for Radiation Protection: basic and applied aspects of dosimetry; Saclay, France; 23 Mar 1976
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Book
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Conference
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AbstractAbstract
[en] The calibration of field dosemeter againts National Standard Dosemeter NPL has been performed. The calibration was done with substitution system on farmer field dosemeter and Radocoon III Victoreen dosemeter. During calibration, it was used different tubes although similar in brand. The calibration is applied to 4 dosemeters consisting of 2 farmer dosemeter and Radocoon III Victoreen dosemeters. The result indicates that there is an influence of the calibration factor value of the detector tubes applied to the different counter devices (meter) although they are same brand. (author). 4 refs, 1 fig, 2 tabs
Original Title
Pengaruh komponen sistem dosimeter pada faktor kalibrasi
Source
National Atomic Energy Agency, Jakarta (Indonesia); 917 p; 1988; p. 259-265; Symposium III on applications of isotopes and radiation; Simposium III Aplikasi Isotop dan Radiasi; Jakarta (Indonesia); 16-17 Dec 1986
Record Type
Miscellaneous
Literature Type
Conference; Numerical Data
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LanguageLanguage
Reference NumberReference Number
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Havranek, V.; Hnatowicz, V.; Kvitek, J.; Obrusnik, I.
Abstracts from the conference on instrumental activation analysis IAA 901990
Abstracts from the conference on instrumental activation analysis IAA 901990
AbstractAbstract
[en] Published in summary form only
Original Title
Kalibrace metody PIXE pomoci tlustych standardu
Primary Subject
Source
Jiranek, V.; Kucera, J. (eds.); Ceskoslovenska Spektroskopicka Spolecnost, Prague (Czechoslovakia); 23 p; Sep 1990; p. 11-12; Conference on instrumental activation analysis IAA 90; Konference o instrumentalni aktivacni analyze IAA 90; Klucenice (Czechoslovakia); 28-31 May 1990
Record Type
Miscellaneous
Literature Type
Conference
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Morel, J.; Imbert, L.; Thomas, C.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Lab. de Metrologie des Rayonnements Ionisants1979
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Lab. de Metrologie des Rayonnements Ionisants1979
AbstractAbstract
No abstract available
Original Title
Etalonnage des chaines de spectrometrie γ. Bilan actuel des etalons, besoins futurs
Secondary Subject
Source
1979; 7 p; Study session on gamma spectrometry; Paris, France; 17 - 18 May 1979; Published in summary form only.
Record Type
Report
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Conference
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INIS IssueINIS Issue
Dickson, B.L.; Christiansen, E.M.; Lovborg, L.
Proceedings of the symposium on uranium exploration methods1982
Proceedings of the symposium on uranium exploration methods1982
AbstractAbstract
[en] Laboratory gamma-ray analyses of potassium, and gamma-equivalent uranium and thorium require accurately known reference standards for calibration. Because of uncertainty in the state of radiometric equilibrium in the uranium and thorium decay chains, reference standards analysed only for uranium and thorium are generally unsuitable. Equivalent uranium standards which have been analysed for radium-226 are reviewed. For equivalent thorium calibration, silicate, rocks with known thorium are adequate. The use of standards spiked with either radium-226 or old thorium salts has been suggested and would appear to offer significant advantages over the available natural matrix standards. The outsdanding question is whether individual laboratories should prepare their own standards or a central supply be established
Source
Nuclear Energy Agency, 75 - Paris (France); 979 p; ISBN 92-64-02350-X;
; 1982; p. 687-698; OECD; Paris (France); Symposium on uranium exploration methods; Paris (France); 1-4 Jun 1982

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Book
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Conference
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Bristow, Q.; Killeen, P.G.; Mwenifumbo, J.C.
Proceedings of the symposium on uranium exploration methods1982
Proceedings of the symposium on uranium exploration methods1982
AbstractAbstract
[en] Gamma-ray logging probes are calibrated in model boreholes which consist of a concrete sandwich containing a central ''ore zone'' and upper and lower ''barren zones''. Unexplained discrepancies have been reported for probes calibrated in model boreholes at Ottawa, Canada; Grand Junction, U.S.A.; and Adelaide, Australia. Intercalibration measurements were made at the three locations using the R and D logging system of the Geological Survey of Canada (G.S.C.) which provides full spectral recording on magnetic tape. The method of full spectral recording made it possible to select, after-the-fact, any desired energy windows in the spectrum and to produce new gamma-ray spectral logs from the re-windowed data. Thus the presence of thorium could be detected and measured and the Z-effect could be taken into account for each model. Fully corrected count-rates within the ore zones and areas under the log curve were determined for every run of every probe in every model for every window. From this information accurate ratios of uranium concentrations in the model holes in different countries were calculated (i.e. relative values). However, absolute uranium grades cannot be assigned until the ''true'' uranium content of any one of the models is determined
Primary Subject
Source
Nuclear Energy Agency, 75 - Paris (France); 979 p; ISBN 92-64-02350-X;
; 1982; p. 715-728; OECD; Paris (France); Symposium on uranium exploration methods; Paris (France); 1-4 Jun 1982

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Book
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Conference
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AbstractAbstract
[en] Two ionization chambers have been used as working standards of absorbed dose. The chambers' stability with time has been confirmed. A laser system for positioning dosemeters in the cobalt-60 beam has been completed
Source
Keam, D.W. (ed.); Australian Radiation Lab., Melbourne; 137 p; Sep 1983; p. 69-71
Record Type
Report
Literature Type
Progress Report
Report Number
Country of publication
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Tyler, D.K.; Woods, M.J.
National Physical Laboratory. Centre for Ionising Radiation Metrology (Great Britain) (United Kingdom)2002
National Physical Laboratory. Centre for Ionising Radiation Metrology (Great Britain) (United Kingdom)2002
AbstractAbstract
[en] The activity assay of a radiopharmaceutical administration to a patient is normally achieved via the use of a radionuclide calibrator. Because of the different geometries and elemental compositions between plastic syringes and glass vials, the calibration factors for syringes may well be significantly different from those for the glass containers. The magnitude of these differences depends on the energies of the emitted photons. For some radionuclides variations have been observed of 70 %, it is therefore important to recalibrate for syringes or use syringe calibration factors. Calibration factors and volume correction factors have been derived for the NPL secondary standard radionuclide calibrator, for a variety of commonly used syringes and needles, for the most commonly used medical radionuclide. (author)
Primary Subject
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Source
NPL report; (no.CIRM56); 2002; 58 p; ISSN 1369-6793;
; Available from British Library Document Supply Centre- DSC:6029. 28071(56); Country of input: International Atomic Energy Agency (IAEA); Includes bibliographical references. Title from cover. [3], ill. (some col.); 30 cm; spiral

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