Table 4.2-07.1 - Standards for Unrestricted Release for NORM and TENORM(a) Surface contamination limits (1) Alpha emitters |
| (i) Removable: | 0.55Bq = 100 cm2 | 15.0 pCi = 100 cm2 | 33 dpm 100 cm2 | average over any one surface |
| | 1.665 Bq = 100 cm2 | 45.0 pCi = 100 cm2 | 100 dpm 100 cm2 | maximum |
| (ii) Total (fixed): | 166.5 Bq = 100 cm2 | 150.0 pCi = 100 cm2 | 1,000 dpm 100 cm2 | average over any one surface |
| | 832.5 Bq = 100 cm2 | 2,250.0 pCi = 100 cm2 | 5,000 dpm 100 cm2 | maximum |
| 2.5 µSv = hr | (0.25 mrem) = hr | maximum at 1 cm from surface |
(2) Beta-gamma emitters |
| (i) Removable: | 3.7 Bq = 100 cm2 | 100.0 pCi = 100 cm2 | average over any one surface |
| | 18.5 Bq = 100 cm2 | 500.0 pCi = 100 cm2 | maximum |
| (ii) Total (fixed) | 2.5 µSv = hr | (0.25 mrem) = hr | maximum at 1 cm from surface |
(b) Concentration in air and water: Appendix B to part 20, Table 2 of section 33.1-10-04.2-01.(c) Concentrations in soil and other materials except water:(1) Radium in soil: Concentration of radionuclides above background concentrations for total radium, averaged over areas of one hundred square meters, shall not exceed: (i) Five (5.0) picocurries per gram of soil, averaged over layers of fifteen centimeters thickness more than fifteen centimeters below the surface.(ii) Five (5.0) picocurries per gram of dry soil, averaged over layers of fifteen centimeters thickness more than fifteen centimeters below the surface.(2) Radium in other materials: Concentration of radionuclides above background concentrations for total radium shall not exceed five (5.0) picocuries per gram.(d) The level of gamma radiation measured at a distance of hundred centimeters from the surface shall not exceed background.N.D. Admin Code tit. 33.1, art. 33.1-10, ch. 33.1-10-04.2, tbl. 4.2-07.1
Adopted by Administrative Rules Supplement 370, October 2018, effective 1/1/2019.General Authority: NDCC 23.1-03-04; S.L. 2017, ch. 199, § 1
Law Implemented: NDCC 23.1-03-03, 23.1-03-04, 23.1-03-05; S.L. 2017, ch. 199, § 18