Balloon brachytherapy is a technique for the removal of a brain tumor in which an inflatable balloon is placed in a resection cavity and then filled with liquid I, delivering low energy dose to the cancerous cells surrounding the cavity. After preparing a patient room to mitigate any spills or contamination, liquid 125I (Iotrex) was assayed with a dose calibrator and injected into the balloon p...

This paper aims to inform the public and scientists not in the field of radioactivity on the way secondary activity measurements are undertaken at NMISA to ensure the quality of life of South Africans. Various secondary standard nuclear instruments are used for routine activity measurements for dissemination to the user community such as the nuclear medicine industry. Three instrument types are...

CONTEXT Measurement of circulating 25-hydroxy-vitamin D [25(OH)D]) is the accepted clinical indicator of vitamin D status. However, between-laboratory differences in measurement of this analyte exist, which may confound clinical care. OBJECTIVES We investigated the current agreement of 25(OH)D measurement in clinical laboratories and explored the possibility that simple calibration would impr...

background: the shielding methods in radiotherapy due to delivering an accurate radiation dose to cancer tissues and avoiding unnecessary dose to normal tissues are very important. these methods include lead standard blocks, individual molding and multi leaf collimator (mlc). the mlc method is not still common in iran radiotherapy centers. individual molding is better than the lead block shield...

present study shows once again that standardization and/or recalibration of immunoassays in general is difficult to achieve with a common calibrator alone but needs split-sample measurements with a reference measurement procedure. This stems from the well-known fact that immunoassays may suffer from differences in behavior related to differences between the matrices of calibrators and those of ...

This thesis presents the design and implementation of a low frequency accelerometer calibrator that will be used to calibrate United States Primary Standard Transducers at the U.S. National Bureau of Standards, Gaithersburg Maryland. Accelerometers convert a rate of change of velocity into a measurable quantity, typically voltage, and must be calibrated to find their sensitivity as the ratio of...

background: natural background radiation of a particular region is one of the distinctive factors defining the status of environment. eloor island is an industrial area in ernakulum district of the state of kerala, india. the indoor and outdoor gamma level measurements have been carried out for the region for evaluating the annual effective dose to the population residing in this area. material...

Nowadays, a lot of time and resources are used to determine the quality of goods and services. As a consequence, the quality of measurements themselves, e.g., the metrological traceability of the measured quantity values is essential to allow a proper evaluation of the results with regard to specifications and regulatory limits. This requires knowledge of the measurement uncertainties of all qu...