[An investigation of ionizing radiation dose in a manufacturing enterprise of ion-absorbing type rare earth ore].
Objective:To investigate radioactive source term dose monitoring and estimation results in a manufacturing enterprise of ion-absorbing type rare earth ore and the possible ionizing radiation dose received by its workers.Methods:Ionizing radiation monitoring data of the posts in the control area and supervised area of workplace were collected, and the annual average effective dose directly estimated or estimated using formulas was evaluated and analyzed.Results:In the control area and supervised area of the workplace for this rare earth ore, α surface contamination activity had a maximum value of 0.35 Bq/cm2and a minimum value of 0.01 Bq/cm2; β radioactive surface contamination activity had a maximum value of 18.8 Bq/cm2and a minimum value of 0.22 Bq/cm2. In 14 monitoring points in the workplace, the maximum value of the annual average effective dose of occupational exposure was 1.641 mSv/a, which did not exceed the authorized limit for workers (5 mSv/a) , but exceeded the authorized limit for general personnel (0.25 mSv/a) . The radionuclide specific activity of ionic mixed rare earth oxides was determined to be 0.9.Conclusion:The annual average effective dose of occupational exposure in this enterprise does not exceed the authorized limit for workers, but it exceeds the authorized limit for general personnel. We should pay attention to the focus of the radiation process, especially for public works radiation.
The Hospital of Prevention and Treatment for Occupational Diseases in Guangzhou, Guangzhou 510620, China.
W F
WF
Zhang
S H
SH
Tang
Q
Q
Tan
Y M
YM
Liu
D006801:Humans; D000072499:Manufacturing and Industrial Facilities; D008674:Metals, Rare Earth; D016273:Occupational Exposure; D011829:Radiation Dosage; D011834:Radiation Monitoring; D011839:Radiation, Ionizing; D017132:Workplace
D008674:Metals, Rare Earth