. . MASS ATTENUATION COEFFICIENTS SAMPLE SOIL SAMPLE RESULTS DIRECT MEASUREMENT 1 0.330 0.337 2 0.324 0.320 3 0.331 0.339 4 0.322 0.328 5“ 0.342 0.342 6 0.340 0.338 7 0.332 0.335 8 0.336 0.337 9 0.327 0.322 10 0.333 0.333 11 0.335 0.329 0.332 0.333 Average Las Vegas Corrrnercial Dirt 0.273 Garden Dirt 0.279 -Desert Soil 0.246