An investigation of ionizing radiation dose in a manufacturing enterprise of ion-absorbing type rare earth ore
10.3760/cma.j.issn.1001-9391.2016.08.018
- VernacularTitle:某离子吸附型稀土矿生产企业电离辐射剂量调查
- Author:
Wanfeng ZHANG
1
;
Shihao TANG
;
Qiang TAN
;
Yimin LIU
Author Information
1. 510620,广州市职业病防治院
- Keywords:
Ion-absorbing type rare earth;
Radiiation dosage;
Radiation,ionizing
- From:
Chinese Journal of Industrial Hygiene and Occupational Diseases
2016;34(8):620-622
- CountryChina
- Language:Chinese
-
Abstract:
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/cm2 and a minimum value of 0.01 Bq/cm2;β radioactive surface contamination activity had a maximum value of 18.8 Bq/cm2 and 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.
