South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-63 - Radioactive Materials (Title A) › Part XII - PHYSICAL PROTECTION OF CATEGORY 1 AND CATEGORY 2 QUANTITIES OF RADIOACTIVE MATERIAL › Appendix A - Category 1 and Category 2 Radioactive Materials

Current through Register Vol. 48, No. 6, June 28, 2024
Table 1-Category 1 and Category 2
				  Threshold
Radioactive material
Category 1(TBq)
Category 1 (Ci)
Category 2 (TBq)
Category 2 (Ci)
Americium-241
60
1,620
0.6
16.2
Americium-241/Be
60
1,620
0.6
16.2
Californium-252
20
540
0.2
5.40
Cobalt-60
30
810
0.3
8.10
Curium-244
50
1,350
0.5
13.5
Cesium-137
100
2,700
1
27.0
Gadolinium-153
1,000
27,000
10
270
Iridium-192
80
2,160
0.8
21.6
Plutonium-238
60
1,620
0.6
16.2
Plutonium-239/Be
60
1,620
0.6
16.2
Promethium-147
40,000
1,080,000
400
10,800
Radium-226
40
1,080
0.4
10.8
Selenium-75
200
5,400
2
54.0
Strontium-90
1,000
27,000
10
270
Thulium-170
20,000
540,000
200
5,400
Ytterbium-169
300
8,100
3
81.0
**The terabecquerel (TBq) values are the regulatory standard.
				  The curie (Ci) values specified are obtained by converting from the TBq value.
				  The curie values are provided for practical usefulness only.
Note:
Calculations Concerning Multiple Sources
				  or Multiple Radionuclides
The "sum of fractions" methodology for evaluating
				  combinations of multiple sources or multiple radionuclides is to be used in
				  determining whether a location meets or exceeds the threshold and is thus
				  subject to the requirements of this part.
I. If multiple sources of the same radionuclide and/or
				  multiple radionuclides are aggregated at a location, the sum of the ratios of
				  the total activity of each of the radionuclides must be determined to verify
				  whether the activity at the location is less than the Category 1 or Category 2
				  thresholds of Table 1, as appropriate. If the calculated sum of the ratios,
				  using the equation below, is greater than or equal to 1.0, then the applicable
				  requirements of this part apply.
II. First determine the total activity for each radionuclide
				  from Table 1. This is done by adding the activity of each individual source,
				  material in any device, and any loose or bulk material that contains the
				  radionuclide. Then use the equation below to calculate the sum of the ratios by
				  inserting the total activity of the applicable radionuclides from Table 1 in
				  the numerator of the equation and the corresponding threshold activity from
				  Table 1 in the denominator of the equation. Calculations must be performed in
				  metric values (i.e., TBq) and the numerator and denominator values must be in
				  the same units.
R1 = total activity for radionuclide
				  1
R2 = total activity for radionuclide
				  2
Rn = total activity for radionuclide
				  n
AR1 = activity threshold for
				  radionuclide 1
AR2 = activity threshold for
				  radionuclide 2
ARn = activity threshold for
				  radionuclide n
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Statement of Need and Reasonableness:
The following presents an analysis of the factors listed in
				  1976 Code Sections
				  1-23-115(C)(1)
				  -(3) and (9)-(11):
DESCRIPTION OF REGULATION: R.61-63, Radioactive Materials
				  (Title A).
Purpose: The Department of Health and Environmental Control
				  proposes amendments to R.61-63 for compliance with federal
				  regulations.
Legal Authority: 1976 Code Section
				  13-7-40(F)(3)
				  &(10).
Plan for Implementation: The amendments will take legal
				  effect upon publication in the State Register. Department personnel will then
				  take appropriate steps to inform the regulated community of the amendments.
				  Additionally, a copy of the regulation will be posted on the Department's
				  website, accessible at
www.scdhec.gov/regulations-table
.
				  Printed copies may also be requested, for a fee, from the Department's Freedom
				  of Information Office.
DETERMINATION OF NEED AND REASONABLENESS OF THE REGULATION
				  BASED ON ALL FACTORS HEREIN AND EXPECTED BENEFITS:
The Department amends R.61-63 for compliance with the
				  Commission's federal regulatory updates. The federal Atomic Energy Act of 1954
				  enable the Commission to enter into agreements with state governors allowing
				  for state regulation of byproduct, source, and special nuclear material.
				  42 U.S.C. Section
				  2121. The Commission enters into such
				  agreements if it finds the state regulatory program complies with applicable
				  federal regulations. The amendments are needed in order to renew South
				  Carolina's ongoing agreement with the Commission. The amendments are beneficial
				  in that they ensure state oversight of required standards.
DETERMINATION OF COSTS AND BENEFITS:
Neither the state nor its political subdivisions will incur
				  additional costs through implementation of these amendments. Existing staff and
				  resources will be utilized to implement these amendments to the regulation. The
				  amendments will not create any significant additional cost to the regulated
				  community since requirements or changes to the regulations will be
				  substantially consistent with the current guidelines utilized by the
				  Department.
UNCERTAINTIES OF ESTIMATES:
None.
EFFECT ON THE ENVIRONMENT AND PUBLIC HEALTH:
These proposed amendments seek to ensure an effective
				  regulatory program for radioactive material users under state jurisdiction and
				  protection of the public and worker from unnecessary exposure to ionizing
				  radiation.
DETRIMENTAL EFFECT ON THE ENVIRONMENT AND PUBLIC HEALTH IF
				  THE REGULATION IS NOT IMPLEMENTED:
None. Federal requirements will apply to all affected users.
				  The proposed amendments eliminate possible duplicative or redundant
				  requirements.