Preliminary Evaluation of the Activity Concentration Limits for Consumer Goods Containing NORM

  • Received : 2015.07.17
  • Accepted : 2016.06.13
  • Published : 2016.06.30


Background: To protect the public from natural radioactive materials, the 'Act on safety control of radioactive rays around living environment" was established in Korea. There is an annual effective dose limit of 1 mSv for products, but the activity concentration limit for products is not established yet. Materials and Methods: To suggest the activity concentration limits for consumer goods containing NORM, in this research, we assumed the "small room model" surrounding the ICRP reference phantom to simulate the consumer goods in contact with the human bodies. Using the Monte Carlo code MCNPX, we evaluate the effective dose rate for the ICRP reference phantom in a small room with dimension of phantom size and derived the activity concentration limit for consumer goods. Results and Discussion: The consumer goods have about 1600, 1200 and $19000Bq{\cdot}kg^{-1}$ for $^{226}Ra$, $^{232}Th$ and $^{40}K$, and the activity concentration limits are about six times comparing with the values of building materials. We applied the index to real samples, though we did not consider radioactivity of $^{40}K$, indexes of the some samples are more than 6. However, this index concept using small room model is very conservative, for the consumer goods over than index 6, it is necessary to reevaluate the absorbed dose considering real usage scenario and material characteristics. Conclusion: In this research, we derived activity concentration limits for consumer goods in contact with bodies and the results can be used as preliminary screening tool for consumer goods as index concept.


  1. European Commission. Radiological protection principles concerning the natural radioactivity of building materials. Radiation Protection 112. 1999;9-10.
  2. Markkanen M. Radiation dose assessments for materials with elevated natural radioactivity. Finnish Centre for Radiation and Nuclear Safety. STUK-B-STO 32. 1995;16-19.
  3. Ahmad N, Hussein AJ, Aslam. Radiation doses in Jordanian dwelling due to natural radioactivity in construction materials and soil. J Environ. Radioactiv. 1998;41(2):127-136.
  4. Risica S, Bolzan C, Nuccetelli C. Radioactivity in building materials: Room model analysis and experimental methods. SCI Total Environ. 2001;272: 119-126.
  5. Marcelo FM, Goro H. Evaulation of indoor gamma radiation dose in dwellings. Radiat. Prot. Dosim. 2004;111(2):221-228.
  6. Ademola JA, Oguneletu PO. Radionuclide content of concrete building blocks and radiation dose rates in some dwelling in Ibadan, Nigeria. J Environ. Radioactiv. 2005;81:107-113.
  7. Al-Jundi J, Ulanovsky A, Prohl G. Doses of external exposure in Jordan house due to gamma-emitting natural radionuclides in building materials. J Environ. Radioactiv. 2009;100:841-846.
  8. Bureau International des Poids et Measures. Table of Radionuclides. Monographie BIPM 5. 2013;75-110.