Earticle

초록

영어

Background: The current study reports measurements of activity concentrations of radon (222Rn) and thoron (220Rn) in dwellings, followed by inhalation dose assessment of the public, and then by the development of regulation and the national radon action plan (NRAP) in Cameroon. Materials and Methods: Radon, thoron, and thoron progeny measurements were carried out from 2014 to 2017 using radon-thoron discriminative detectors (commercially RADUET) in 450 dwellings and thoron progeny monitors in 350 dwellings. From 2019 to 2020, radon track detectors (commercially RADTRAK) were deployed in 1,400 dwellings. It was found that activity concentrations of radon range in 1,850 houses from 10 to 2,620 Bq/m3 with a geometric mean of 76 Bq/m3. Results and Discussion: Activity concentrations of thoron range from 20 to 700 Bq/m3 with a geometric mean of 107 Bq/m3. Thoron equilibrium factor ranges from 0.01 to 0.6, with an arithmetic mean of 0.09 that is higher than the default value of 0.02 given by UNSCEAR. On average, 49%, 9%, and 2% of all surveyed houses have radon concentrations above 100, 200, and 300 Bq/m3, respectively. The average contribution of thoron to the inhalation dose due to radon and thoron exposure is about 40%. Thus, thoron cannot be neglected in dose assessment to avoid biased results in radio-epidemiological studies. Only radon was considered in the drafted regulation and in the NRAP adopted in October 2020. Reference levels of 300 Bq/m3 and 1,000 Bq/m3 were recommended for dwellings and workplaces. Conclusion: Priority actions for the coming years include the following: radon risk mapping, promotion of a protection policy against radon in buildings, integration of the radon prevention and mitigation into the training of construction specialists, mitigation of dwellings and workplaces with high radon levels, increased public awareness of the health risks associated with radon, and development of programs on the scientific and technical aspects.

목차

ABSTRACT
Introduction
Materials and Methods
1. Study Areas
2. RADUET Detectors
3. Thoron Progeny Monitors
4. RADTRAK Detectors
5. Inhalation Dose Assessment
Results and Discussion
1. Radon, Thoron and Thoron Progeny Concentrations
2. Inhalation Dose
3. Radon Regulation and NRAP
Conclusion
Conflict of Interest
Acknowledgements
Funding
Author Contributions
References

키워드

저자

• Saïdou [ Research Centre for Nuclear Sciences and Technology, Institute of Geological and Mining Research, Yaoundé, Cameroon; Nuclear Physics Laboratory, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon ] Corresponding Author
• Shinji Tokonami [ Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Japan ]
• Masahiro Hosoda [ 3Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Japan, Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, Hirosaki, Japan ]
• Augustin Simo [ National Radiation Protection Agency, Yaoundé, Cameroon ]
• Joseph Victor Hell [ Research Centre for Nuclear Sciences and Technology, Institute of Geological and Mining Research, Yaoundé, Cameroon ]
• Olga German [ Department of Nuclear Safety and Security, International Atomic Energy Agency, Vienna, Austria ]
• Esmel Gislere Oscar Meless [ Department of Technical Cooperation, International Atomic Energy Agency, Vienna, Austria ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  방사선방어학회지 [Journal of Radiation Protection and Research]

• 간기

  계간

• pISSN

  2508-1888

• 수록기간

  1976~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 559 DDC 629