The EPD Series, an electronic personal dosimeter, is a portable device that can measure the cumulative radiation dose levels and radiation dose exposure rate of locations and individuals who may be susceptible to the radiation exposure in real-time, allowing anyone to easily measure accurately. The EPD series is the world's smallest high-performance personal dosimeter that can be easily carried in pocket or as a necklace, allowing convenient measurement of an individual’s radioactive contamination. In addition, if the measured radiation dose rate exceeds the recommended level, the LED will light up and a warning beep will be displayed to alert the state of radioactive contamination to anyone without knowledge of the dangerous radiation levels. The device can be charged through the micro-USB port, and can operate up to 300 continuous hours per single charge. There are two buttons on the control panel of the EPD Series, one to power on or off the device and the other to alert the users. The LCD display shows dose rate/cumulative dose/dose elapsed time/alarm setting status/remaining battery/device error.