Arnedo M A, Rubiano J G, Alonso H, Tejera A, González A, González J, Gil J M, Rodríguez R, Martel P, Bolivar J P
Dpto. Física, Universidad de Las Palmas de Gran Canaria, Campus de Tafira, 35017 Las Palmas de Gran Canaria, Spain.
Dpto. Física, Universidad de Las Palmas de Gran Canaria, Campus de Tafira, 35017 Las Palmas de Gran Canaria, Spain.
J Environ Radioact. 2017 Jan;166(Pt 2):242-258. doi: 10.1016/j.jenvrad.2016.07.010. Epub 2016 Sep 12.
The Canary Islands archipielago (Spain) comprises seven main volcanic islands and several islets that form a chain extending for around 500 km across the eastern Atlantic, between latitudes 27°N and 30°N, with its eastern edge only 100 km from the NW African coast. The administrative province of Las Palmas comprises the three eastern Canary Islands (Lanzarote, Fuerteventura and Gran Canaria). An extensive study of terrestrial gamma dose rates in surface soils has been carried out to cover the entire territory of the province (4093 km). The average outdoor gamma dose rate in air at 1 m above ground is 73 nGyh at Gran Canaria, 32 nGyh at Fuerteventura, and 25 nGyh at Lanzarote. To complete the radiological characterization of this volcanic area, 350 soil samples at 0-5 cm depth were collected to cover all the geologic typologies of the islands. These samples were measured using high resolution gamma spectrometry to determine the activity concentrations of Ra, Th and K. The average values obtained were 25.2 Bq/kg, 28.9 Bq/kg, and 384.4 Bq/kg, respectively. Maps of terrestrial gamma activity, effective dose, and activity concentrations of Ra, Th and K for the region have been developed through the use of geostatistical interpolation techniques. These maps are in accord with the geology of the islands.
加那利群岛（西班牙）由七个主要火山岛和几个小岛组成，这些岛屿形成了一条横跨东大西洋、位于北纬27°至30°之间、绵延约500公里的岛链，其东端距离西北非海岸仅100公里。拉斯帕尔马斯行政区包括加那利群岛东部的三个岛屿（兰萨罗特岛、富埃特文图拉岛和大加那利岛）。为覆盖该省的整个区域（4093平方公里），已对地表土壤中的陆地伽马剂量率进行了广泛研究。在大加那利岛，地面上方1米处空气中的平均室外伽马剂量率为73纳戈瑞每小时，在富埃特文图拉岛为32纳戈瑞每小时，在兰萨罗特岛为25纳戈瑞每小时。为完成对该火山地区的放射性特征描述，采集了350个深度为0至5厘米的土壤样本，以涵盖这些岛屿的所有地质类型。使用高分辨率伽马能谱仪对这些样本进行测量，以确定镭、钍和钾的活度浓度。所获得的平均值分别为25.2贝克勒尔/千克、28.9贝克勒尔/千克和384.4贝克勒尔/千克。通过使用地质统计学插值技术，绘制了该地区的陆地伽马活度、有效剂量以及镭、钍和钾活度浓度的地图。这些地图与这些岛屿的地质情况相符。
