Example 1

DOE-STD -1136-2004

Guide of Good Practices for Occupational Radiation Protection in Uranium Faci lities

considered approximations only. If exact values of specific activity are required, they should be

determined a nalytically. See Example 1 for the calculation of blending enrichments.

Example 1

One kilogram of 20% enriched uranium is blended with 1 kilogram of 2%

enriched uranium.

SA = [0.4 + 0.38E + 0.0034E2] x 10-6 Ci/g

SA20 = [0.4 + 0.38 (20) + 0.0034 (20)2] x 10-6 Ci/g

= 9.36 x 10-6 Ci/g

SA2 = [0.4 + 0.38 (2) + 0.0034 (2)2] x 10-6 Ci/g

= 1.17 x 10-6 Ci/g

The specific activity of the resulting mixture is

[(9.36 + 1.17)/2] x 10-6 Ci/g = 5 x 10-6 Ci/g

2-8