Radiation Safety Manual 1997

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10 CFR Part 20 Appendix C - Quantities of Licensed Material Requiring Labeling
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Part IV: 10 CFR Part 20 Appendix C - Quantities of Licensed Material Requiring Labeling
Radionuclide

Quantity (µCi)

Hydrogen-3

1,000.000

Beryllium-7

1,000.000

Beryllium-10

1.000

Carbon-11

1,000.000

+Carbon-14

100.000

Fluorine-18

1,000.000

Sodium-22

10.000

Sodium-24

100.000

Magnesium-28

100.000

Aluminum-26

10.000

Silicon-31

1,000.000

Silicon-32

1.000

Phosphorus-32

10.000

Phosphorus-33

100.000

Sulfur-35

100.000

Chlorine-36

10.000

Chlorine-38

1,000.000

Chlorine-39

1,000.000

Argon-39

1,000.000

Argon-41.000

1,000.000

Potassium-40

100.000

Potassium-42

1,000.000

Potassium-43

1,000.000

Potassium-44

1,000.000

Potassium-45

1,000.000

Calcium-41

100.000

Calcium-45

100.000

Calcium-47

100.000

Scandium-43

1,000.000

Scandium-44m

100.000

Scandium-44

100.000

Scandium-46

10.000

Scandium-47

100.000

Scandium-48

100.000

Scandium-49

1,000.000

Titanium-44

1.000

Titanium-45

1,000.000

Vanadium-47

1,000.000

Vanadium-48

100.000

Vanadium-49

1,000.000

Chromium-48

1,000.000

Chromium-49

1,000.000

Chromium-51

1,000.000

Manganese-51

1,000.000

Manganese-52m

1,000.000

Manganese-52

100.000

Manganese-53

1,000.000

Manganese-54

100.000

Manganese-56

1,000.000

Iron-52

100.000

Iron-55

100.000

Iron-59

10.000

Iron-60

1.000

Cobalt-55

100.000

Cobalt-56

10.000

Cobalt-57

100.000

Cobalt-58m

1,000.000

Cobalt-58

100.000

Cobalt-60m

1,000.000

Cobalt-60

1.000

Cobalt-61

1,000.000

Cobalt-62m

1,000.000

Nickel-56

100.000

Nickel-57

100.000

Nickel-59

100.000

Nickel-63

100.000

Nickel-65

1,000.000

Nickel-66

10.000

Copper-60

1,000.000

Copper-61

1,000.000

Copper-64

1,000.000

Copper-67

1,000.000

Zinc-62

100.000

Zinc-63

1,000.000

Zinc-65

10.000

Zinc-69m

100.000

Zinc-69

1,000.000

Zinc-71m

1,000.000

Zinc-72

100.000

Gallium-65

1,000.000

Gallium-66

100.000

Gallium-67

1,000.000

Gallium-68

1,000.000

Gallium-70

1,000.000

Gallium-72

100.000

Gallium-73

1,000.000

Germanium-66

1,000.000

Germanium-67

1,000.000

Germanium-68

10.000

Germanium-69

1,000.000

Germanium-71

1,000.000

Germanium-75

1,000.000

Germanium-77

1,000.000

Germanium-78

1,000.000

Arsenic-69

1,000.000

Arsenic-70

1,000.000

Arsenic-71

100.000

Arsenic-72

100.000

Arsenic-73

100.000

Arsenic-74

100.000

Arsenic-76

100.000

Arsenic-77

100.000

Arsenic-78

1,000.000

Selenium-70

1,000.000

Selenium-73m

1,000.000

Selenium-73

100.000

Selenium-75

100.000

Selenium-79

100.000

Selenium-81m

1,000.000

Selenium-81

1,000.000

Selenium-83

1,000.000

Bromine-74m

1,000.000

Bromine-74

1,000.000

Bromine-75

1,000.000

Bromine-76

100.000

Bromine-77

1,000.000

Bromine-80m

1,000.000

Bromine-80

1,000.000

Bromine-82

100.000

Bromine-83

1,000.000

Bromine-84

1,000.000

Krypton-74

1,000.000

Krypton-76

1,000.000

Krypton-77

1,000.000

Krypton-79

1,000.000

Krypton-81

1,000.000

Krypton-83m

1,000.000

Krypton-85m

1,000.000

Krypton-85

1,000.000

Krypton-87

1,000.000

Krypton-88

1,000.000

Rubidium-79

1,000.000

Rubidium-81m

1,000.000

Rubidium-81

1,000.000

Rubidium-82m

1,000.000

Rubidium-83

100.000

Rubidium-84

100.000

Rubidium-86

100.000

Rubidium-87

100.000

Rubidium-88

1,000.000

Rubidium-89

1,000.000

Strontium-80

100.000

Strontium-81

1,000.000

Strontium-83

100.000

Strontium-85m

1,000.000

Strontium-85

100.000

Strontium-87m

1,000.000

Strontium-89

10.000

Strontium-90

0.100

Strontium-91

100.000

Strontium-92

100.000

Yttrium-86m

1,000.000

Yttrium-86

100.000

Yttrium-87

100.000

Yttrium-88

10.000

Yttrium-90m

1,000.000

Yttrium-90

10.000

Yttrium-91m

1,000.000

Yttrium-91

10.000

Yttrium-92

100.000

Yttrium-93

100.000

Yttrium-94

1,000.000

Yttrium-95

1,000.000

Zirconium-86

100.000

Zirconium-88

10.000

Zirconium-89

100.000

Zirconium-93

1.000

Zirconium-95

10.000

Zirconium-97

100.000

Niobium-88

1,000.000

Niobium-89m (66 min)

1,000.000

Niobium-89 (122 min)

1,000.000

Niobium-90

100.000

Niobium-93m

10.000

Niobium-94

1.000

Niobium-95m

100.000

Niobium-95

100.000

Niobium-96

100.000

Niobium-97

1,000.000

Niobium-98

1,000.000

Molybdenum-90

100.000

Molybdenum-93m

100.000

Molybdenum-93

10.000

Molybdenum-99

100.000

Molybdenum-101

1,000.000

Technetium-93m

1,000.000

Technetium-93

1,000.000

Technetium-94m

1,000.000

Technetium-94

1,000.000

Technetium-96m

1,000.000

Technetium-96

100.000

Technetium-97m

100.000

Technetium-97

1,000.000

Technetium-98

10.000

Technetium-99m

1,000.000

Technetium-99

100.000

Technetium-101

1,000.000

Technetium-104

1,000.000

Ruthenium-94

1,000.000

Ruthenium-97

1,000.000

Ruthenium-103

100.000

Ruthenium-105

1,000.000

Ruthenium-106

1.000

Rhodium-99m

1,000.000

Rhodium-99

100.000

Rhodium-100

100.000

Rhodium-101m

1,000.000

Rhodium-101

10.000

Rhodium-102m

10.000

Rhodium-102

10.000

Rhodium-103m

1,000.000

Rhodium-105

100.000

Rhodium-106m

1,000.000

Rhodium-107

1,000.000

Palladium-100

100.000

Palladium-101

1,000.000

Palladium-103

100.000

Palladium-107

10.000

Palladium-109

100.000

Silver-102

1,000.000

Silver-103

1,000.000

Silver-104m

1,000.000

Silver-104

1,000.000

Silver-105

100.000

Silver-106m

100.000

Silver-106

1,000.000

Silver-108m

1.000

Silver-110m

10.000

Silver-111

100.000

Silver-112

100.000

Silver-115

1,000.000

Cadmium-104

1,000.000

Cadmium-107

1,000.000

Cadmium-109

1.000

Cadmium-113m

0.100

Cadmium-113

100.000

Cadmium-115m

10.000

Cadmium-115

100.000

Cadmium-117m

1,000.000

Cadmium-117

1,000.000

Indium-109

1,000.000

Indium-110 (69.1min.).

1,000.000

Indium-110 (4.9h)

1,000.000

Indium-111

100.000

Indium-112

1,000.000

Indium-113m

1,000.000

Indium-114m

10.000

Indium-115m

1,000.000

Indium-115

100.000

Indium-116m

1,000.000

Indium-117m

1,000.000

Indium-117

1,000.000

Indium-119m

1,000.000

Tin-110

100.000

Tin-111

1,000.000

Tin-113

100.000

Tin-117m

100.000

Tin-119m

100.000

Tin-121m

100.000

Tin-121

1,000.000

Tin-123m

1,000.000

Tin-123

10.000

Tin-125

10.000

Tin-126

10.000

Tin-127

1,000.000

Tin-128

1,000.000

Antimony-115

1,000.000

Antimony-116m

1,000.000

Antimony-116

1,000.000

Antimony-117

1,000.000

Antimony-118m

1,000.000

Antimony-119

1,000.000

Antimony-120 (16min.)

1,000.000

Antimony-120 (5.76d)

100.000

Antimony-122

100.000

Antimony-124m

1,000.000

Antimony-124

10.000

Antimony-125

100.000

Antimony-126m

1,000.000

Antimony-126

100.000

Antimony-127

100.000

Antimony-128 (10.4min.)

1,000.000

Antimony-128 (9.01h)

100.000

Antimony-129

100.000

Antimony-130

1,000.000

Antimony-131

1,000.000

Tellurium-116

1,000.000

Tellurium-121m

10.000

Tellurium-121

100.000

Tellurium-123m

10.000

Tellurium-123

100.000

Tellurium-125m

10.000

Tellurium-127m

10.000

Tellurium-127

1,000.000

Tellurium-129m

10.000

Tellurium-129

1,000.000

Tellurium-131m

10.000

Tellurium-131

100.000

Tellurium-132

10.000

Tellurium-133m

100.000

Tellurium-133

1,000.000

Tellurium-134

1,000.000

Iodine-120m

1,000.000

Iodine-120

100.000

Iodine-121

1,000.000

Iodine-123

100.000

Iodine-124

10.000

Iodine-125

1.000

Iodine-126

1.000

Iodine-128

1,000.000

Iodine-129

1.000

Iodine-130

10.000

Iodine-131

1.000

Iodine-132m

100.000

Iodine-132

100.000

Iodine-133

10.000

Iodine-134

1,000.000

Iodine-135

100.000

Xenon-120

1,000.000

Xenon-121

1,000.000

Xenon-122

1,000.000

Xenon-123

1,000.000

Xenon-125

1,000.000

Xenon-127

1,000.000

Xenon-129m

1,000.000

Xenon-131m

1,000.000

Xenon-133m

1,000.000

Xenon-133

1,000.000

Xenon-135m

1,000.000

Xenon-135

1,000.000

Xenon-138

1,000.000

Cesium-125

1,000.000

Cesium-127

1,000.000

Cesium-129

1,000.000

Cesium-130

1,000.000

Cesium-131

1,000.000

Cesium-132

100.000

Cesium-134m

1,000.000

Cesium-134

10.000

Cesium-135m

1,000.000

Cesium-135

100.000

Cesium-136

10.000

Cesium-137

10.000

Cesium-138

1,000.000

Barium-126

1,000.000

Barium-128

100.000

Barium-131m

1,000.000

Barium-131

100.000

Barium-133m

100.000

Barium-133

100.000

Barium-135m

100.000

Barium-139

1,000.000

Barium-140

100.000

Barium-141.000

1,000.000

Barium-142

1,000.000

Lanthanum-131

1,000.000

Lanthanum-132

100.000

Lanthanum-135

1,000.000

Lanthanum-137

10.000

Lanthanum-138

100.000

Lanthanum-140

100.000

Lanthanum-141

100.000

Lanthanum-142

1,000.000

Lanthanum-143

1,000.000

Cerium-134

100.000

Cerium-135

100.000

Cerium-137m.

100.000

Cerium-137

1,000.000

Cerium-139

100.000

Cerium-141

100.000

Cerium-143

100.000

Cerium-144

1.000

Praseodymium-136

1,000.000

Praseodymium-137

1,000.000

Praseodymium-138m

1,000.000

Praseodymium-139

1,000.000

Praseodymium-142m

1,000.000

Praseodymium-142

100.000

Praseodymium-143

100.000

Praseodymium-144

1,000.000

Praseodymium-145

100.000

Praseodymium-147

1,000.000

Neodymium-136

1,000.000

Neodymium-138

100.000

Neodymium-139m

1,000.000

Neodymium-139

1,000.000

Neodymium-141

1,000.000

Neodymium-147

100.000

Neodymium-149

1,000.000

Neodymium-151

1,000.000

Promethium-141.000

1,000.000

Promethium-143

100.000

Promethium-144

10.000

Promethium-145

10.000

Promethium-146

1.000

Promethium-147

10.000

Promethium-148m

10.000

Promethium-148

10.000

Promethium-149

100.000

Promethium-150

1,000.000

Promethium-151.000

100.000

Samarium-141m

1,000.000

Samarium-141

1,000.000

Samarium-142

1,000.000

Samarium-145

100.000

Samarium-146

1.000

Samarium-147

100.000

Samarium-151

10.000

Samarium-153

100.000

Samarium-155

1,000.000

Samarium-156

1,000.000

Europium-145

100.000

Europium-146

100.000

Europium-147

100.000

Europium-148

10.000

Europium-149

100.000

Europium-150 (12.62h).

100.000

Europium-150 (34.2y)

1.000

Europium-152m

100.000

Europium-152

1.000

Europium-154

1.000

Europium-155

10.000

Europium-156

100.000

Europium-157

100.000

Europium-158

1,000.000

Gadolinium-145

1,000.000

Gadolinium-146

10.000

Gadolinium-147

100.000

Gadolinium-148

0.001.000

Gadolinium-149

100.000

Gadolinium-151

10.000

Gadolinium-152

100.000

Gadolinium-153

10.000

Gadolinium-159

100.000

Terbium-147

1,000.000

Terbium-149

100.000

Terbium-150

1,000.000

Terbium-151.

100.000

Terbium-153.

1,000.000

Terbium-154.

100.000

Terbium-155

1,000.000

Terbium-156m (5.0h)

1,000.000

Terbium-156m (24.4h)

1,000.000

Terbium-156

100.000

Terbium-157

10.000

Terbium-158

1.000

Terbium-160

10.000

Terbium-161

100.000

Dysprosium-155

1,000.000

Dysprosium-157

1,000.000

Dysprosium-159

100.000

Dysprosium-165

1,000.000

Dysprosium-166

100.000

Holmium-155

1,000.000

Holmium-157

1,000.000

Holmium-159

1,000.000

Holmium-161

1,000.000

Holmium-162m

1,000.000

Holmium-162

1,000.000

Holmium-164m

1,000.000

Holmium-164

1,000.000

Holmium-166m

1.000

Holmium-166

100.000

Holmium-167

1,000.000

Erbium-161

1,000.000

Erbium-165

1,000.000

Erbium-169

100.000

Erbium-171

100.000

Erbium-172

100.000

Thulium-162

1,000.000

Thulium-166

100.000

Thulium-167

100.000

Thulium-170

10.000

Thulium-171

10.000

Thulium-172

100.000

Thulium-173

100.000

Thulium-175

1,000.000

Ytterbium-162

1,000.000

Ytterbium-166

100.000

Ytterbium-167

1,000.000

Ytterbium-169

100.000

Ytterbium-175

100.000

Ytterbium-177

1,000.000

Ytterbium-178

1,000.000

Lutetium-169

100.000

Lutetium-170

100.000

Lutetium-171

100.000

Lutetium-172

100.000

Lutetium-173

10.000

Lutetium-174m

10.000

Lutetium-174

10.000

Lutetium-176m

1,000.000

Lutetium-176

100.000

Lutetium-177m

10.000

Lutetium-177

100.000

Lutetium-178m

1,000.000

Lutetium-178

1,000.000

Lutetium-179

1,000.000

Hafnium-170

100.000

Hafnium-172

1.000

Hafnium-173

1,000.000

Hafnium-175

100.000

Hafnium-177m

1,000.000

Hafnium-178m

0.100

Hafnium-179m

10.000

Hafnium-180m

1,000.000

Hafnium-181

10.000

Hafnium-182m

1,000.000

Hafnium-182

0.100

Hafnium-183

1,000.000

Hafnium-184

100.000

Tantalum-172

1,000.000

Tantalum-173

1,000.000

Tantalum-174

1,000.000

Tantalum-175

1,000.000

Tantalum-176

100.000

Tantalum-177

1,000.000

Tantalum-178

1,000.000

Tantalum-179

100.000

Tantalum-180m

1,000.000

Tantalum-180

100.000

Tantalum-182m

1,000.000

Tantalum-182

10.000

Tantalum-183

100.000

Tantalum-184

100.000

Tantalum-185

1,000.000

Tantalum-186

1,000.000

Tungsten-176

1,000.000

Tungsten-177

1,000.000

Tungsten-178

1,000.000

Tungsten-179

1,000.000

Tungsten-181

1,000.000

Tungsten-185

100.000

Tungsten-187

100.000

Tungsten-188

10.000

Rhenium-177

1,000.000

Rhenium-178

1,000.000

Rhenium-181

1,000.000

Rhenium-182 (12.7h)

1,000.000

Rhenium-182 (64.0h)

100.000

Rhenium-184m

10.000

Rhenium-184

100.000

Rhenium-186m

10.000

Rhenium-186

100.000

Rhenium-187

1,000.000

Rhenium-188m

1,000.000

Rhenium-188

100.000

Rhenium-189

100.000

Osmium-180

1,000.000

Osmium-181

1,000.000

Osmium-182

100.000

Osmium-185

100.000

Osmium-189m

1,000.000

Osmium-191m

1,000.000

Osmium-191

100.000

Osmium-193

100.000

Osmium-194

1.000

Iridium-182

1,000.000

Iridium-184

1,000.000

Iridium-185

1,000.000

Iridium-186

100.000

Iridium-187

1,000.000

Iridium-188

100.000

Iridium-189

100.000

Iridium-190m

1,000.000

Iridium-190

100.000

Iridium-192 (73.8d)

1.000

Iridium-192m (1.4min.)

10.000

Iridium-194m

10.000

Iridium-194

100.000

Iridium-195m

1,000.000

Iridium-195

1,000.000

Platinum-186

1,000.000

Platinum-188

100.000

Platinum-189

1,000.000

Platinum-191

100.000

Platinum-193m

100.000

Platinum-193

1,000.000

Platinum-195m

100.000

Platinum-197m

1,000.000

Platinum-197

100.000

Platinum-199

1,000.000

Platinum-200

100.000

Gold-193

1,000.000

Gold-194

100.000

Gold-195

10.000

Gold-198m

100.000

Gold-198

100.000

Gold-199

100.000

Gold-200m

100.000

Gold-200

1,000.000

Gold-201

1,000.000

Mercury-193m

100.000

Mercury-193

1,000.000

Mercury-194

1.000

Mercury-195m

100.000

Mercury-195

1,000.000

Mercury-197m

100.000

Mercury-197

1,000.000

Mercury-199m

1,000.000

Mercury-203

100.000

Thallium-194m

1,000.000

Thallium-194

1,000.000

Thallium-195

1,000.000

Thallium-197

1,000.000

Thallium-198m

1,000.000

Thallium-198

1,000.000

Thallium-199

1,000.000

Thallium-200

1,000.000

Thallium-201

1,000.000

Thallium-202

100.000

Thallium-204

100.000

Lead-195m

1,000.000

Lead-198

1,000.000

Lead-199

1,000.000

Lead-200

100.000

Lead-201

1,000.000

Lead-202m

1,000.000

Lead-202

10.000

Lead-203

1,000.000

Lead-205

100.000

Lead-209

1,000.000

Lead-210.000

0.010

Lead-211.000

100.000

Lead-212

1.000

Lead-214

100.000

Bismuth-200

1,000.000

Bismuth-201

1,000.000

Bismuth-202

1,000.000

Bismuth-203

100.000

Bismuth-205

100.000

Bismuth-206

100.000

Bismuth-207

10.000

Bismuth-210m

0.100

Bismuth-210

1.000

Bismuth-212

10.000

Bismuth-213

10.000

Bismuth-214

100.000

Polonium-203

1,000.000

Polonium-205

1,000.000

Polonium-207

1,000.000

Polonium-210

0.100

Astatine-207

100.000

Astatine-211

10.000

Radon-220

1.000

Radon-222

1.000

Francium-222

100.000

Francium-223

100.000

Radium-223

0.100

Radium-224

0.100

Radium-225

0.100

Radium-226

0.100

Radium-227

1,000.000

Radium-228

0.100

Actinium-224

1.000

Actinium-225

0.0100

Actinium-226

0.100

Actinium-227

0.001

Actinium-228

1.000

Thorium-226

10.000

Thorium-227

0.010

Thorium-228

0.001

Thorium-229

0.001

Thorium-230

0.001

Thorium-231

100.000

Thorium-232

100.000

Thorium-234

10.000

Thorium-natural

100.000

Protactinium-227

10.000

Protactinium-228

1.000

Protactinium-230

0.100

Protactinium-231.000

0.001

Protactinium-232

1.000

Protactinium-233

100.000

Protactinium-234

100.000

Uranium-230

0.0100

Uranium-231

100.000

Uranium-232

0.001

Uranium-233

0.001

Uranium-234

0.001

Uranium-235

0.001

Uranium-236

0.001

Uranium-237

100.000

Uranium-238

100.000

Uranium-239

1,000.000

Uranium-240

100.000

Uranium-natural

100.000

Neptunium-232

100.000

Neptunium-233

1,000.000

Neptunium-234

100.000

Neptunium-235

100.000

Neptunium-236 (1.15x10^5y)

0.001

Neptunium-236 (22.5h)

1.000

Neptunium-237

0.001

Neptunium-238

10.000

Neptunium-239

100.000

Neptunium-240

1,000.000

Plutonium-234

10.000

Plutonium-235

1,000.000

Plutonium-236

0.001

Plutonium-237

100.000

Plutonium-238

0.001

Plutonium-239

0.001

Plutonium-240

0.001

Plutonium-241.000

0.010

Plutonium-242

0.001

Plutonium-243

1,000.000

Plutonium-244

0.001

Plutonium-245

100.000

Americium-237

1,000.000

Americium-238

100.000

Americium-239

1,000.000

Americium-240

100.000

Americium-241

0.001

Americium-242m

0.001

Americium-242

10.000

Americium-243

0.001

Americium-244m

100.000

Americium-244

10.000

Americium-245

1,000.000

Americium-246m

1,000.000

Americium-246

1,000.000

Curium-238

100.000

Curium-240

0.100

Curium-241

1.000

Curium-242

0.010

Curium-243

0.001

Curium-244

0.001

Curium-245

0.001

Curium-246

0.001

Curium-247

0.001

Curium-248

0.001

Curium-249

1,000.000

Berkelium-245

100.000

Berkelium-246

100.000

Berkelium-247

0.001

Berkelium-249

0.100

Berkelium-250

10.000

Californium-244

100.000

Californium-246

1.000

Californium-248

0.010

Californium-249

0.001

Californium-250

0.001

Californium-251

0.001

Californium-252

0.001

Californium-253

0.100

Californium-254

0.001

Any alpha emitting radionuclide not listed above or mixtures of alpha emitters of unknown composition.

0.001

Einsteinium-250

100.000

Einsteinium-251.000

100.000

Einsteinium-253

0.100

Einsteinium-254m

1.000

Einsteinium-254

0.010

Fermium-252

1.000

Fermium-253

1.000

Fermium-254

10.000

Fermium-255

1.000

Fermium-257

0.010

Mendelevium-257

10.000

Mendelevium-258

0.010

Any radionuclide other than alpha emitting radionuclides not listed above, or mixtures of beta emitters of unknown composition

0.010

{1} The quantities listed here were derived by taking 1/10th of the most restrictive ALI listed in table 1, columns 1 and 2, of appendix B to §§ 20.1001-20.2401 of this part, rounding to the nearest factor of 10, and arbitrarily constraining the values listed between 0.001 and 1,000 µCi. Values of 100 µCi have been assigned for radionuclides having a radioactive half-life in excess of 109 years (except rhenium, 1000 µCi) to take into account their low specific activity. Note: For purposes of §§ 20.1902(e), 20.1905(a), and 20.2201(a) where there is involved a combination of radionuclides in known amounts, the limit for the combination should be derived as follows: determine, for each radionuclide in the combination, the ratio between the quantity present in the combination and the limit otherwise established for the specific radionuclide when not in combination. The sum of such ratios for all radionuclides in the combination may not exceed ``1'' (i.e., ``unity'').

[56 FR 23465, May 21, 1991; 56 FR 61352, Dec. 3, 1991. Redesignated + and amended at 58 FR 67659, Dec. 22, 1993; 60 FR 20183, Apr. 25, 1995]

See 10 CFR Part 20 for current information