Problems in microweighing

Gallic, Y. Le

doi:10.1016/0029-554x(73)90816-1

Cited by 8 publications

(5 citation statements)

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“…Care must be taken to avoid liquid on the outside of the pycnometer since this evaporates at an increased rate and falsifies mass determination. In Le Gallic [28], this phenomenon was taken into account as an uncertainty of 1 µg. At the LNHB, these effects are taken into account as a method uncertainty which is estimated to be 3 µg (1.5 µg for w 1 and for w 3 , see section 4.2.…”

Section: Uncertainties From the Weighing Methodsmentioning

confidence: 99%

“…At the LNHB, the difference between the third and the second weight registered is used to check that it corresponds to the conventional mass(es) of the standard weight(s) added [28]. The two values should be in agreement within twice the uncertainty value on the standard weight(s) used.…”

Section: Procedures For Dispensing Micro-drops Of Master Solution Usi...mentioning

confidence: 99%

“…After weighing the pycnometer, a set of calibration weights are placed on the balance with a total mass as close as possible to the mass of the full pycnometer. This method, was the most accurate and used extensively in the 1970s to not rely to a large extend on the optical scale of balances of former generations, which were used as transfer instruments only [28]. However, with electromagnetic force compensation balances, this method has two major drawbacks: the long weighing time increases uncertainty on losses through evaporation during preparation, and problems can arise concerning the reliability of the reference weights which are in permanent use.…”

Section: Substitution Weighingmentioning

confidence: 99%

“…However, with electromagnetic force compensation balances, this method has two major drawbacks: the long weighing time increases uncertainty on losses through evaporation during preparation, and problems can arise concerning the reliability of the reference weights which are in permanent use. [28]. The set of calibration weights is used at the beginning of the manipulation to check the performance of the balance.…”

Section: Substitution Weighingmentioning

confidence: 99%

“…At the LNHB, the difference between the third and the second weight registered is used to check that it corresponds to the conventional mass(es) of the standard weight(s) added [28].…”

Section: Procedures For Dispensing Micro-drops Of Master Solution Usi...mentioning

confidence: 99%

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Weighing uncertainties in quantitative source preparation for radionuclide metrology

Lourenço

Bobin

2015

Metrologia

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In radionuclide metrology, the assessment of activity concentrations is directly related to the mass determination in quantitative source preparation. As far as primary measurements are concerned, the associated weighing uncertainty has a non-negligible contribution in the uncertainty budget. Several parameters influencing the mass determination have to be considered in source preparation and for the evaluation of the weighing uncertainty: technical specifications of calibrated balances, environmental quantities such as air buoyancy and other disturbance sources like electrostatic effects. The accuracy of mass determination is also conditioned by good practices in source preparation. This article reviews the different parameters in the evaluation of the weighing uncertainty. Its aim is also to give some guidance on how to achieve the smallest uncertainty.

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Section: Uncertainties From the Weighing Methodsmentioning

confidence: 99%

Section: Procedures For Dispensing Micro-drops Of Master Solution Usi...mentioning

confidence: 99%

Section: Substitution Weighingmentioning

confidence: 99%

Section: Substitution Weighingmentioning

confidence: 99%

“…At the LNHB, the difference between the third and the second weight registered is used to check that it corresponds to the conventional mass(es) of the standard weight(s) added [28].…”

Section: Procedures For Dispensing Micro-drops Of Master Solution Usi...mentioning

confidence: 99%

See 3 more Smart Citations