Passive and active measurements of radon-related parameters inside ancient Egyptian tombs in Luxor

Active measurements show that radon exhalation rates range from 0.68±0.30 to 1.47±0.27Bqm-2h-1 and from 0.60±0.03 to 1.42±0.05Bqm-2h-1 for passive measurements. The real radium content was determined for all examined tombs by HPGe detector, while the effective radium content was obtained by Alpha-Guard and sealed cup techniques. Radon exhalation rates were correlated with the real radium content. A good correlation was found between active and passive measurements of radon exhalation rate.