Possibility of radioactivity measurement using an isothermal microcalorimeter

The radioactivity measurement method using a calorimeter uses the 1st law of thermodynamics. Because of the characteristic of heat energy, the calorimeter is not affected by the geometry of the source. It is also expected that high-level radioactivity can be measured. However, because the measurement range of the calorimeter differs from other radiation detectors, studies are being conducted to secure the possibility of radioactivity measurement. A comparison between the triple-to-double coincidence ratio and calorimeter was performed using 32P, a pure beta-emitter.