International Intercomparisons of Photometric Base Units

The Detector-Based Candela Scale and Related Photometric Calibration Procedures at NIST

The candela, one of the SI base units, has been realized by using absolutely calibrated detectors rather than sources. A group of eight photometers was constructed using silicon photodiodes, precision apertures, and glass filters for V (λ) match. Their absolute spectral responsivities were calibrated against the NIST absolute spectral responsivity scale. The measurement chain has been significa...

Mise en pratique for the definition of the candela and associated derived units for photometric and radiometric quantities in the International System of Units (SI)

Evaluation of the annual Canadian biodosimetry network intercomparisons

PURPOSE To evaluate the importance of annual intercomparisons for maintaining the capacity and capabilities of a well-established biodosimetry network in conjunction with assessing efficient and effective analysis methods for emergency response. MATERIALS AND METHODS Annual intercomparisons were conducted between laboratories in the Canadian National Biological Dosimetry Response Plan. Interc...

IAEA Intercomparisons in the Frame of the Occupational Radiation Protection Programme

The IAEA safety activities to support the assessment of occupational exposure through a comprehensive set of Safety Guides, Safety Reports and other related documents will soon be completed. Several intercomparison exercises were organized by the IAEA on the determination of radionuclides in human urine samples, whole body counting and external dosimetry. These previous intercomparison exercise...

High-throughput photometric titrimetry based on a feedback-based and subsequent fixed triangular wave-controlled flow ratiometry.

The principle of flow ratiometry for high-throughput titration, which we recently proposed for potentiometric titration, was extended to photometric titration. The flow rate (FB) of a base solution containing an acid-base indicator was linearly varied in response to a control voltage (Vc) generated from a computer. With the total (acid + base) flow rate (FT) being kept constant, the base soluti...