A Surface Soil Radioactivity Mapping Has Been Carried Out at Muria Peninsula, Central Java

The air of this mapping is to gain exposure dose value of the soil surface of Muria Peninsula. Central Java, in the area of 75 km radius from Ujung Lemah Abang. Lemah Abang is the proposed site of the first indonesian nuclear Power Plant. A radioactivity data obtained in 1995/1996 to 1998/1999 researches has been used for input data. For further analysis, a conversation factor multiplication is applied. This conversation factor is obtained from linear regression equation of the relationship between radioactivity and exposure values gained from re-measured randomly 44 points which are representative for high, medium, and low radiation areas obtained in 1995/1996 to 1998/1999 activities and it taking soil samples. The conversation data result is being constructed of the Surface Exposure Dose Map of Muria Peninsula. Those data show that the exposure dose of northern slope of Muria Volcano is relatively higher than that of southern slope, it means be harmonizing to the soil sample radioactivity values. The maximum radioactivity value of the soil samples is 3,56.10-2 Bq/gram (α radiation), 8,22.10-1 Bq/gram (β radiation) and 6,20.10-1 Bq/gram (γ radiation) and the minimum values are 4,44 10-3 Bq/gram (α radiation), 1,50. 10-1 Bq/gram (β radiation) and 4,09. 10-2 Bq/gram (γ radiation). (author)