The investigation of radiation level in a coal preparation plant

Objective: The dose equivalent rate of densitometer workplace was detected and analyzed in a coal preparation plant to help the radioactive protection and staff health. Methods: The γ dose rate instrument was used to detect the workplace dose equivalent rate of densitometer as standard requirements. Results: The dose equivalent rate from the radioactive source container 10 cm and 100 cm were 4.19∼21.1 μSv/h and 0.30∼3.47 μSv/h, which from the detectors 5 cm and 100 cm were 11.8∼465 μSv/h and 0.53∼54.5 μSv/h, when the switches were on without materials in channels. Conclusion: The levels of dose equivalent rate were higher than those of the standard requirements in some densitometer workplace when the switches were on without materials in channels. In order to protect staff health, there should be some measures to be taken such as closing the switch of radioactive source container timely in no production, or far away from the densitometer workplace. (authors)