Measurements of radiation dose level around 3W1 beamline of Beijing electron-positron collider

The author describes the possible radiation sources and their characteristics around 3W1 beamline of Beijing Electron-Positron Collider (BEPC). A homemade monitoring system is used to measure the dose level around 3W1 beamline. The obtained results show that the radiation field depends on the BEPC operation conditions. During the normal storage operation, the radiation field is a slowly changing field. The dose level is proportional to the beam intensity. However when electrons are injected into the storage ring, the radiation field becomes a fast changing field with a very high dose level. Furthermore the results indicate that when the beam loss accidentally occurred near to 3W1 beamline beamline, it led to rapid increase of dose level