Regular radon activity concentration and effective dose measurements inside the great pyramid with passive nuclear track detectors.
Radon activity concentrations and equilibrium factors inside the great pyramid of "Cheops" were measured with passive nuclear track detectors. The variation of these concentrations in location was investigated. Seasonal variation of radon activity concentrations with winter maximum and summer minimum were observed inside the pyramid. The 1-y average radon activity concentration ranged from a minimum of 20 to a maximum of 170 Bq m(-3). Results show that the yearly average equilibrium factor between radon and its progeny was assessed as 0.16 and 0.36 inside the pyramid and near entrance, respectively. Moreover, the estimated annual effective dose was 0.05 mSv to tour guides and varied from 0.19 to 0.36 mSv for the pyramid guards; for visitors the average effective dose was 0.15 microSv per visit. These are lower than the 3-10 mSv y(-1) dose limit recommend by ICRP 65.
Hafez
A F
AF
Faculty of Science, Department of Physics, University of Alexandria, 21511, Alexandria, Egypt.
Bishara
A A
AA
Kotb
M A
MA
Hussein
A S
AS
D000280:Administration, Inhalation; D000396:Air Pollutants, Radioactive / Q000032:analysis* / Q000493:pharmacokinetics; D016902:Air Pollution, Indoor / Q000032:analysis*; D000512:Alpha Particles; D001822:Body Burden; D003198:Computer Simulation; D004534:Egypt; D006801:Humans; D008954:Models, Biological; D016273:Occupational Exposure / Q000032:analysis; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis; D012621:Seasons
D000396:Air Pollutants, Radioactive; D017687:Radon Daughters; D011886:Radon