Q: Excel data to a Raster Map I am trying to create a radiometric map, I have x, y , z coordinates and a value in excel. I want to create a raster map based on this data. How do I go about doing this. I am using ArcGIS 10 with Target/ 

A: I am assuming that you are interested in interpolating the data into a raster (unless the points are already in a regular grid). 
You should import your data into ArcMap as a points layer using the add x/y data tool. Then you can interpolate the points into a raster using your z value with the IDW interpolation with spatial analyst. 
There are other interpolation methods worth considering, but IDW is the simplest.
