Chapter DHS 157 Appendix A

Register June 2023 No. 810

Chapter DHS 157

APPENDIX A

Exempt Concentrations - See PDF for table - See PDF for table

Note 1: Many radionuclides transform into other radionuclides. In expressing the concentrations in Appendix A, the activity stated is that of the parent radionuclide and takes into account the radioactive decay products.

Note 2: For purposes of s. DHS 157.09 (2) where there is involved a combination of radionuclides, the limit for the combination should be derived as follows: Determine for each radionuclide in the product the ratio between the radioactivity concentration present in the product and the exempt radioactivity concentration established in Appendix A for the specific radionuclide when not in combination. The sum of such ratios may not exceed “1”.

- See PDF for diagram

Note 3: To convert microcuries /ml to SI units of megabecquerels per liter multiply the above values by 37.

Example: Zirconium (40) Zr-97 (2x10-4 microcuries/ml multiplied by 37 is equivalent to 74 x 10-4 MBq/l).

2/ microcuries/g for solids.