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We have devised a standardization method for a sealed point source that can be applied to nuclides such as 22Na that emit a positron and at least one gamma ray. This method is based on coincidence counting of annihilation radiation and gamma rays using a scintillation detector array. In the present study, we performed Monte Carlo simulations to examine this method for various measurement conditions...
Background: In order to evaluate the uncertainty in the radioactivity measurements performed using PET scanners and to determine the calibration factors of these scanners, it is essential that the radioactive sources are equipped with absorber materials that ensure the annihilation of positrons. Therefore, the evaluation and calibration depend on scatter and attenuation corrections in conventional...
As key devices for power conversion, we can expect power semiconductor modules to become increasingly sophisticated in functions and performance in the years to come. This will require the development of advanced insulation materials and design technologies.
The characteristics of microtransformers were estimated by FEM. A microtransformer consists of a multilayered core and a conductor-embedded core. The dependence of both the inductance and the equivalent resistance of the core on the size is discussed, and the relationship between the magnetic properties of the core and the transformer characteristics is also considered. For a small transformer, a...
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