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Calin M.R.,Horia Hulubei National Institute of Physics and Nuclear Engineering | Druker A.E.,National Institute of Metrology
Romanian Reports of Physics | Year: 2011

The paper presents the energy and FWHM calibration of a gamma spectrometric system with a HPGe detector on the basis of the environmental spectrum. Source

Based on the reference document [1], the article proposes the way to calculate the errors of indication and associated measurement uncertainties, by resorting to the general information provided by the calibration certificate of a balance (non-automatic weighing instruments, shortly NAWI) used in medical field. The paper may be also considered a useful guideline for: - operators working in laboratories accredited in medical (or other various fields) where the weighing operations are part of their testing activities; - test houses, laboratories, or manufacturers using calibrated non-automatic weighing instruments for measurements relevant for the quality of production subject to QM requirements (e.g. ISO 9000 series, ISO 10012, ISO/IEC 17025); - bodies accrediting laboratories; - accredited laboratories for the calibration of NAWI. Article refers only to electronic weighing instruments having maximum capacity up to 30 kg. Starting from the results provided by a calibration certificate it is presented an example of calculation. © 2011 IFSA. Source

Valcu A.,National Institute of Metrology
2015 9th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2015 | Year: 2015

The paper presents the assessment way of electronic weighing instruments according to their use. Thus, in mass measurements there are two ways to use a weighing instrument: as a mass comparator, in the dissemination of mass unit from national mass standard to standards of the lowest accuracy and as a direct weighing instrument, a common balance, used in different applications. Even if, in term of constructive and functional points of view the two type of weighing instruments are not different, their use differs and hence, the need to approach different assessment methods. In the paper, it is highlighted the difference between determination of measurable properties by calibration, for both, mass comparators and a common balance (non-automatic weighing instruments-NAWI), making a parallel between them. © 2015 IEEE. Source

Calin M.R.,Horia Hulubei National Institute of Physics and Nuclear Engineering | Druker A.E.,National Institute of Metrology | Radulescu I.,Horia Hulubei National Institute of Physics and Nuclear Engineering
Journal of Radioanalytical and Nuclear Chemistry | Year: 2013

This paper presents a method for efficiency calibration of a measuring alpha-beta system PROTEAN ORTEC, MPC-2000-DP, using standard radioactive sources. The system is used to measure gross alpha-beta activity concentrations in environmental samples. The calculated efficiencies of detection were subsequently introduced in the system for two working geometries: measuring geometry - gross alpha-beta εα g = 31,37 ± 0.25 (%) - the alpha efficiency and εβ g = 44.94 ± 0.69 (%) - the beta efficiency, where the spillover factor is Xg talk = 25.59 ± 0.50 (%) and measuring geometry up alpha-beta εα u = 36.23 ± 0.29 (%) - the alpha efficiency and εβ u = 48.53 ± 0.74 (%) - the beta efficiency, where the spillover factor is Xu talk = 31.08 ± 0.60 (%). © 2012 Akadémiai Kiadó, Budapest, Hungary. Source

Melikyan S.R.,National Institute of Metrology
Measurement Techniques | Year: 2015

A new nonlinear optical laser surface profilometer with micron surface resolution is considered. It is shown that with a resolution of the spectrometer of 0.23 nm the spatial resolution of the proposed method may reach 22.5 μm. © 2015, Springer Science+Business Media New York. Source

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