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NATURAL RADIUM ISOTOPES PRESENT IN SOME COSMETIC PRODUCTS: DETERMINATION OF ACTIVITY CONCENTRATION AND DOSE

A Milena-Pérez1, B R Martínez-Martínez1, E Álvarez2

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Natural cosmetics contain radium isotopes (226Ra, 228Ra), but their levels in 18 products were below public safety limits. The estimated skin dose from these cosmetics poses no radiological risk.

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Area of Science:

  • Environmental Science
  • Radiological Health
  • Cosmetic Science

Background:

  • Natural ingredients like clays and plant extracts have long been used in cosmetics.
  • The use of natural sources in cosmetics raises concerns about potential radionuclide accumulation, particularly radium isotopes (226Ra, 228Ra).

Purpose of the Study:

  • To determine the concentration of radium isotopes (226Ra and 228Ra) in natural cosmetic products.
  • To estimate the effective dose to the skin from these natural cosmetics.
  • To assess the radiological risk associated with the use of natural cosmetics.

Main Methods:

  • Analysis of 18 natural cosmetic samples to quantify 226Ra and 228Ra concentrations.
  • Calculation of the effective dose to the skin based on measured radionuclide levels.

Main Results:

  • 226Ra concentrations ranged from 7.9 ± 5.0 to 37.6 ± 12.5 Bq kg-1.
  • 228Ra concentrations ranged from 2.5 ± 1.7 to 35.4 ± 2.6 Bq kg-1.
  • The mean estimated effective skin dose was 13.1 ± 4.9 μSv y-1.

Conclusions:

  • Radon isotope concentrations in the studied natural cosmetics are within acceptable limits.
  • The estimated effective dose is significantly below the public reference level of 50 mSv y-1.
  • No radiological risk was identified from the use of these natural cosmetic products.