calibration laboratory Articles

  • Sample Size for Laboratory Calibration of Subsurface Neutron Moisture Gauges

    The estimation of adequate sample size is critical to all laboratory methods of calibration of neutron moisture gauges. Neutron gauge response is a function of the true sample geometry rather than an arbitrarily defined spherical geometry. A two-group solution is obtained for neutron flux in a homogeneous, finite, cylindrical sample. The theoretical flux distributions for this solution and for ...


    By ASTM International

  • Recommendations for Implementing a Calibration Program

    Introduction This article is limited to the principles of organization for calibration work in relation to cGMP and other pharmaceutical standards. Calibration and metrology methods related to actual calibration techniques, statistics, and theories are not explored in our discussions.1 Each class of instruments requires specific techniques and approaches to achieve stated accuracies. All ...


    By Prime Technologies, Inc.

  • Procedure for calibration of micropipettors

    PURPOSE: Good Laboratory Practice dictates that all equipment used for the generation, measurement or assessment of data shall be adequately tested, calibrated and/or standardized. A procedure describing a pipettor calibration method, records of test performance and repairs should be available for laboratory personnel. This procedure describes a method for evaluating the accuracy and ...


  • Why calibrate PULSE?

    This famous remark emphasises the importance of measurement in the world of science, industry and commerce. We all use and depend on it daily, in even the most mundane aspects of life – from setting your wristwatch to the radio time signal, to filling the car fuel-tank, or checking the weather forecast. All of these things depend on proper calibration and traceability to national and ...

  • Balance Calibration – what are the options?

    Balances are relied on in most laboratories and industrial sites for a range of experiments and everyday quality control or operational work. Keeping your balance regularly calibrated is essential to ensure the readings they give are accurate. This does not need to mean a costly visit from an external contractor, as many balances are easily calibrated in house. ...


    By Camlab Limited

  • An update of the probabilistic safety assessment of the Radiation Monitor Calibration Laboratory of a Brazilian nuclear power station

    In 2001, a probabilistic safety assessment of the Radiation Monitor Calibration Laboratory of a Brazilian nuclear power station was performed to estimate its radiological risk. Owing to the lack of data, many conservative assumptions were considered. The purpose of this paper is to obtain the updated laboratory radiological risk. A human reliability analysis of the procedure for calibrating the ...


    By Inderscience Publishers

  • Laboratory and Field Calibration of a Neutron Depth Moisture Gauge for Use in High Water Content Soils

    In recent years radioisotopes have been increasingly used for determining site values of the density and the water content of soils. Since field measurements obtained by neutron moisture gauges are relative, these instruments must be calibrated. Calibration is usually carried out in the laboratory by plotting neutron counting rates versus known water content values of several soil media, ...


    By ASTM International

  • Calibration – the sure way to accurate measurements

    Calibration   During testing, microphones and accelerometers can change sensitivity or break. They might look intact, but what happens if you continue measuring without having calibrated your transducer? Can you trust your data? Do you have to redo the entire test? In cases of extreme testing you might only have one shot at getting your measurement right as the product gets ...

  • Laboratory Filter Paper Suction Measurements

    Results of filter paper measurements for both matric and total suction values are reported for a sand, silt, and clay. Calibration curves for the matric and total suction are given for the filter paper used in this study, and comparisons with the results of several other researchers are made. For low suction values, the matric suction is more easily measured than the total suction using the ...


    By ASTM International

  • Calibration stability of the sievers 900 series TOC analyzers

    Objective One of the advantages of the membrane conductivity measurement system employed in the Sievers 900 Series TOC Analyzers, compared to other TOC analyzers, is the excellent stability of the calibration. To illustrate this, a series of tests were conducted on three 900 Series analyzers over the course of a 14-month period and the results are  summarized in this report . The 900 ...


    By GE Analytical Instruments

  • Optimising laboratory environment for successful IVF

    The London Women’s Clinic in Cardiff (LWC Wales) is one of ten clinics within its group which collectively provide expert fertility treatment to families across England and Wales. When it comes to IVF and fertility treatment there is no ‘off-the-shelf’ or ‘one size fits all’ solution and, as such, the medical teams produce a bespoke fertility programme for each and ...


    By Geotech

  • Environics - Reducing calibration gas cost by up to 60%

    EPA's appendix 'M' 40 CFR 51 reduces calibration gas cost by 60%By: Terrence P. Dunn, President of EnvironicsOn May 30, 1995, the EPA published the final version of Method 205 for inclusion in Appendix M of 40 CFR Part 51 entitled, 'Verification of Gas Dilution Systems for Field Instrument Calibrations.' Continuous emissions monitoring systems (CEMS) require ...


    By Environics, Inc.

  • Preparation of Large-Size Laboratory Deposits of Cohesive Soil

    High-quality, large-size cohesive soil deposits can be prepared in the laboratory using the slurry method, which has many advantages for research and calibration purposes. The requirements for such deposits are discussed, and details are presented of the apparatus used successfully to prepare deposits of Cornell clay. Fifteen medium-size deposits (0.6 m diameter by 1.2 m deep) and one large-size ...


    By ASTM International

  • Uncertainty in environmental analysis: theory and laboratory studies

    In this paper, theoretical and practical aspects of uncertainty in environmental laboratory analysis are presented and discussed. A more detailed theory of uncertainty is described, with special emphasis on the factors which contribute to the understanding of this in order to obtain accurate environmental laboratory data analysis. A full discussion is reported relating to approaches used to ...


    By Inderscience Publishers

  • Calibration of a Dynamic Penetrometer for Compaction Quality Control of Boiler Slag

    A dynamic penetrometer was designed for the purpose of evaluating compaction quality in fills constructed with boiler slag. Laboratory and field calibration tests were conducted to study the effect of densification on dynamic penetration resistance. The effects of specimen preparation method (pluviation and impact compaction) and saturation on dynamic penetration resistance were investigated in ...


    By ASTM International

  • Laboratory Information Management Systems and Traceability of Quality Systems

    Today’s business environment places many demands on technical managers and corporate executives. At a time when global competition forces companies to introduce products at a faster pace with higher efficiency and productivity, quality systems like ISO and Six Sigma, stipulate rigorous testing documentation. Regulatory systems, such as Good Manufacturing Practices (GMPs) and Good Laboratory ...


    By STARLIMS Corporation

  • BTEX monitor, equal performances to laboratory chromatographs

    Environnement S.A leveraged its technical leadership in this field with an extensive experience, being one of the first companies creating its first BTEX analyser almost 20 years ago. The VOC72M third generation of ...


    By Environnement S.A

  • Sitelab gains laboratory certification with New Jersey DEP

    Located in New Jersey?  Use UVF instead of Gas Chromatography to save time and money on your next project! The New Jersey Department of Environmental Protection is the first state regulatory agency in the country to approve and certify the use of field analytical methods as part of their "Triad Approach," without compromising data quality and reliability.  Using UVF for ...


    By Sitelab Corporation

  • Re‐calibration of the earthworm tier 1 risk assessment of plant protection products

    In the first step of the earthworm risk assessment for plant protection products the risk is assessed by comparing the no‐observed effect levels (NOEL) from the laboratory reproduction tests with the predicted exposure of the plant protection product in soil while applying a trigger value (assessment factor; AF) to cover uncertainties. If this indicates a potential risk, field studies are ...


    By John Wiley & Sons, Ltd.

  • U.S. Federal Agencies benefit from accredited laboratories

    Accreditation is the independent evaluation of conformity assessment bodies against recognized standards to carry out specific activities to ensure their impartiality and competence. Through the application of national and international standards, government, procurers and consumers can have confidence in calibration and test results, and inspection reports provided. The International Laboratory ...


    By ASTM International

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