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Additional info for Recommended Screening Limits for Contaminated Surface Soil and Review of Factors Relevant to Site-Specific Studies: Recommendations of the National ... Protection and Measurements

Sample text

3 cm below the surface. " Nuclide Ratio Organ Bone Bone Skin Bone Bone Bone Bone Bone Skin Bone Bone surface surface surface surface surface surface surface surface surface "Based on dose factor for adults from Eckerman and Ryrnan (1993) for 15 cm slab. Note that the organs for which doses are given in Eckerman and Ryman (1993) are limited to gonad, breast, lung, bone marrow, bone surface, thyroid, and skin. 40 / 3. 2-Ratio of E to air kerma (Sv Gy-I) for various gamma emitters as a function of angle of incidence.

Paved over. Judicious application of the tabulated screening limits would mandate that for sites with land use not exactly conforming to those for which the guidance is formulated, one should apply the screening limits for the closest most conservative match. If none of the land uses examined are appropriate, alternate screening limits should be derived. This can be accomplished easily using the individual pathway screening doses and safety factors given in the appendices. One should note that for nuclides where the external dose pathway dominates, the dose is less sensitive to the land use than for nuclides where either the inhalation or ingestion dose predominates.

Calculations of dose tend to be less certain, and reported values differ more than for kerma due to differences in the assumed geometry of the target organs (phantom geometry) and angle of incidence (Eckerman and Ryman, 1993). This is particularly true for the lowenergy gamma ray emitters. The results of Eckerman and Ryman often differ from those of Jacob et al. because of differences in organ geometry and the fact that Eckerman and Ryman include the dose from electrons and brehmstrahlung while the results of Jacob et al.

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