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This paper reports the activity concentration of three natural radionuclides, 226 Ra, 232 Th and 40 K, found in Alpinia Galangal plants which are widely used in various Asian cuisines and traditional medicine. The galangal plants and their relevant soils were collected from four provinces in the north of Thailand under natural field conditions. The activity concentration of radionuclides was determined using gamma-ray spectrometry. Soil-to-plant transfer factors (TFs) for 226 Ra, 232 Th and 40 K were investigated in rhizome and aerial parts of the galangal plants. The activity concentration in the soils ranged from 22 to 88 Bq kg-1 for 226 Ra, 27 to 157 Bq kg-1 for 232 Th and 58 to 1157 Bq kg-1 for 40 K. In Alpinia Galangal, the concentration ranged from< 0.2 to 2.0 Bq kg-1 for 226 Ra,< 0.1 to 2.9 Bq kg-1 for 232 Th and 205 to 2247 Bq kg-1 for 40 K. The TF ranged from< 0.002 to 0.073 for 226 Ra,< 0.001 to 0.061 for 232 …