Case Study- Kuroshima Island, Japan
Spatial Distribution Assessment Using GIS of Radon and Nutrients
- The 222Rn activity in the nearshore reef ranged from a low of 16 to as much as 318 Bq/m3 at 40 sampling locations around Kuroshima island of Japan during March and September, 2009.
- Radon level was observed very high at sampling point 1-4(204.1 Bq/m3), 2-2 (193.9 Bq/m3), 2-5(233 Bq/m3), 2-6(318 Bq/m3), 2-9(262.3 Bq/m3), 2-13(197.7 Bq/m3), 2-14(159.8 Bq/m3) and 2-16(178.3 Bq/m3) in March 2009.
- However, in September 2009, the radon level was very high at 1-18(240.3 Bq/m3), 2-6(170.9 Bq/m3) and 2-13(151.2 Bq/m3).
- The spatial distributions of radon revealed that groundwater discharge was higher (ranging between 100-150 Bq/m3) particularly in north area,
- West area and south-eastern area of Kuroshima as shown in Figure (a) by red and yellow circles.
- The seasonal distribution of radon indicates not too much difference in the sampling locations except at some sampling locations ranging from 2-1 to 2-17 as shown in Figure (a).
- However, the seasonal distribution of nitrite and nitrate indicates almost same trend except at location 1-4, 1-16 and 2-6 (Figure b).