The new calibration technique has been developed, with which measurement equipments in remote place can be calibrated through an internet system. Traceability will be maintained by this new technology named as "e-trace". The experiment was carried out between NMIJ (National Metrology Institute of Japan) and JRIA (Japan Radioisotope Association). An ionization chamber at JRIA was calibrated remotely from NMIJ. It was confirmed that the equipment for radioactivity measurement was calibrated remotely by the e-trace technique.