A5041518745- Radioactive Decay and Measurement Techniques
- Radioactivity and Radon Measurements
- Scientific Measurement and Uncertainty Evaluation
- Radioactive contamination and transfer
- Radiation Detection and Scintillator Technologies
- Enzyme Structure and Function
- Nuclear Physics and Applications
- Clinical Laboratory Practices and Quality Control
- Biochemical and Molecular Research
- Radiopharmaceutical Chemistry and Applications
- Radiation Dose and Imaging
- Metabolism and Genetic Disorders
- Body Composition Measurement Techniques
- Neutrino Physics Research
- Medical Imaging Techniques and Applications
- Cardiovascular and exercise physiology
Australian Nuclear Science and Technology Organisation
2016-2023
National Metrology Institute of South Africa
2005-2013
The hypothesis that proximity to the Sun causes variation of decay constants at permille level has been tested and disproved. Repeated activity measurements mono-radionuclide sources were performed over periods from 200 days up four decades 14 laboratories across globe. Residuals exponential nuclear curves inspected for annual oscillations. Systematic deviations a purely curve differ one data set another are attributable instabilities in instrumentation measurement conditions. most stable...
We report the discovery of a systematic miscalibration during work-up process for site validation multicenter clinical PET imaging trial using <sup>68</sup>Ga, which manifested as consistent and reproducible underestimation in quantitative accuracy (assessed by SUV) range systems from different manufacturers at several facilities around Australia. <b>Methods:</b> Sites were asked to follow strict preparation protocol create radioactive phantom with <sup>68</sup>Ga be imaged standard before...
Claims that proximity to the Sun causes variation of decay constants at permille level have been investigated for alpha decaying nuclides. Repeated rate measurements 209Po, 226Ra, 228Th, 230U, and 241Am sources were performed over periods 200 d up two decades various nuclear metrology institutes around globe. Residuals from exponential curves inspected annual oscillations. Systematic deviations a purely curve differ in amplitude phase one data set another appear attributable instabilities...
The hypothesis that seasonal changes in proximity to the Sun cause variation of decay constants at permille level has been tested for radionuclides disintegrating through electron capture and beta plus decay. Activity measurements 22Na, 54Mn, 55Fe, 57Co, 65Zn, 82+85Sr, 90Sr, 109Cd, 124Sb, 133Ba, 152Eu, 207Bi sources were repeated over periods from 200 d up more than four decades 14 laboratories across globe. Residuals exponential nuclear curves inspected annual oscillations. Systematic...
Claims that proximity to the Sun causes variations of decay constants at permille level have been investigated for beta-minus decaying nuclides. Repeated activity measurements 3H, 14C, 60Co, 85Kr, 90Sr, 124Sb, 134Cs, 137Cs, and 154Eu sources were performed over periods 259 d up 5 decades various nuclear metrology institutes. Residuals from exponential curves inspected annual oscillations. Systematic deviations a purely curve differ in amplitude phase one data set another appear attributable...
Abstract When verifying the validity of exponential-decay law through 137 precise decay rate measurement series at various nuclear laboratories, minor violations have been observed in shape annual cycles residuals with different amplitudes and phase shifts. The timing amplitude these deviations compared local weather data it appears that ambient humidity is highly correlated instabilities radioactivity measurements. In fact, when compensating for a linear relationship absolute air, most are...
Main text Since 1976, 30 laboratories have submitted 85 samples of 60 Co to the International Reference System (SIR) for activity comparison at Bureau des Poids et Mesures (BIPM), with identifier BIPM.RI(II)- K1.Co-60. Recently, PTB (Germany), NIST (United States), SMU (Slovakia), BARC (India), LNE-LNHB (France), POLATOM (Poland), ENEA-INMRI (Italy), NPL Kingdom), LNMRI-IRD (Brazil), NMISA (South Africa) and ANSTO (Australia) participated in key reference value (KCRV) has been updated. The...