Michigan Administrative Code › Department - Environmental Quality › Office of Waste Management & Radiological Protection › Ionizing Radiation Rules for Radioactive Material › Part 5 - STANDARDS FOR PROTECTION AGAINST RADIATION › TRANSPORTATION › Section R. 325.5270 - Notes to Appendices A1 to A9

Current through Vol. 24-12, July 15, 2024
Rule 270.
*Soluble (S): Insoluble (I).
**"Sub" means that values given are for submersion in a
						semi-spherical infinite cloud of airborne material.
***For purposes of these rules, it may be assumed that
						the daughter activity concentrations in the following table are equivalent to
						an air concentration of 10-7 microcuries of
						radon-222 per milliliter of air in equilibrium with the daughters polonium-218,
						lead-214, bismuth-214, and polonium-214:
Maximum Time Between Collection and Measurement
									 (hours)*
Alpha-Emitting Daughter Activity Collected per
									 Milliliter of Air
Microcuries per milliliter
Total Alpha Disintegrations per minute per
									 milliliter
0.5
7.2 x 10-8
0.16
1.0
4.5 x 10-8
0.10
2.0
1.3 x 10-8
0.028
3.0
0.3 x 10-8
0.0072
* The duration of sample collection and the duration of
						measurement should be sufficiently short compared to the time between
						collection and measurement, as not to have a statistically significant effect
						upon the results.
****For soluble mixtures of U-238, U-234, and U-235 in
						air
,
chemical toxicity may be the limiting factor. If the percent
						by weight (enrichment) of U-235 is less than 5, the concentration value for a
						40-hour workweek, table I, is 0.2 milligrams uranium per cubic meter of air
						average. For any enrichment, the product of the average concentration and time
						of exposure during a 40hour workweek shall not exceed 8 x
						10-3 SA µCi-hr/ml, where SA is the specific
						activity of the uranium inhaled. The concentration value for table II is 0.007
						milligrams uranium per cubic meter of air. The specific activity for natural
						uranium is 6.77 x 10-7 curies per gram U. The
						specific activity for other mixtures of U-238, U-235
,
and U-234,
						if not known, shall be:
SA = 3.6 x 10-7 curies/gram U
						U-depleted
SA = (0.4 + 0.38 E + 0.0034
						E2) 10-6 E[GREATER THAN
						EQUAL TO] 0.72 where E is the percentage by weight of U-235, expressed as
						percent.
NOTE: In any case where there is a mixture in air or
						water of more than 1 radionuclide, the limiting values for purposes of this
						appendix should be determined as follows:
1. If the identity and concentration of each
					 radionuclide in the mixture are known, the limiting values should be derived as
					 follows: Determine, for each radionuclide in the mixture, the ratio between the
					 quantity present in the mixture and the limit otherwise established in Appendix
					 "A" for the specific radionuclide when not in a mixture. The sum of such ratios
					 for all the radionuclides in the mixture may not exceed "1" (i.e., "unity").
Example: If radionuclides a, b, and c are present in
						concentrations Ca, Cb, and Cc, and if the applicable Maximum Permissible
						Concentrations (MPC's) are MPCa, MPCb, and MPCc respectively, then the
						concentrations shall be limited so that the following relationship
						exists:
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2. If either the identity or the
					 concentration of any radionuclide in the mixture is not known, the limiting
					 values for purposes of Appendix "A" shall be:
a. For purposes of Table I, Column 1 6 x
					 10-13
b.
					 For purposes of Table I, Column 2 4 x 10-7
c. For purposes of Table II, Column 1 2 x
					 10-14
d.
					 For purposes of Table II, Column 2 3 x
					 10-8