SCHEDULE 23Radioactive substances activities

PART 6Radioactive substances activity exemptions

SECTION 9Tables and summation rules in this Part

Table 425

The Table 4 referred to in Sections 2 and 3 of this Part—

Table 4Radioactive material and accumulated radioactive waste: values of maximum quantities

Substance or article

Maximum quantity of radionuclides for each substance or article

Maximum quantity of radionuclides:

(a) on any premises in items which satisfy the limit in column 2, or

(b) in mobile radioactive apparatus held by a person

A sealed source of a type not described in any other row of this Table

4 x 106 Bq

2 x 108 Bq

A Class A gaseous tritium light device

2 x 1010 Bq

5 x 1012 Bq

A Class B gaseous tritium light device

1 x 1012 Bq

3 x 1013 Bq

A Class C gaseous tritium light device

1 x 1012 Bq

No limit

Any sealed source which is solely radioactive material or radioactive waste because it contains tritium

2 x 1010 Bq

5 x 1012 Bq

A tritium foil source

2 x 1010 Bq

5 x 1012 Bq

A smoke detector affixed to premises

4 x 106 Bq

No limit

An electrodeposited source

6 x 108 Bq Ni-63 or 2 x 108 Bq Fe-55

6 x 1011 Bq

A luminised article

8 x 107 Bq Pm-147 or 4 x 109 Bq H-3

4 x 1010 Bq Pm-147 or 2 x 1011 Bq H-3

A Ba-137m eluting source

4 x 104 Bq Cs-137+

4 x 105 Bq Cs-137+

A substance or article which is or contains magnesium alloy or thoriated tungsten in which the thorium concentration does not exceed 4% by mass

No limit

No limit

A uranium or thorium compound

Up to a total of 5kg of uranium and thorium

Up to a total of 5kg of uranium and thorium

A substance or article (other than a sealed source) which is intended for use for, used for, or arises from medical or veterinary diagnosis or treatment or clinical or veterinary trials

1 x 109 Bq Tc-99m

1 x 109 Bq Tc-99m

and

and

F22 x 108 Bq of all other radionuclides, (no more than 1 x 108 Bq of which is contained in radioactive material)

2 x 108 Bq of all other radionuclides, (no more than 1 x 108 Bq of which is contained in radioactive material)

F1Table 4A25A

1

The Table 4A referred to in Sections 2, 5 and 6 of this Part is—

Table 4ANORM waste concentrations and maximum disposal quantities

Radionuclide

Type 1 NORM concentration (Bq/g)

Type 1 NORM total activity for landfill (GBq/year)

Type 1 NORM total activity for incineration (MBq/year)

Type 2 NORM concentration (Bq/g)

U-238sec

5

50

100

10

U238+

5

50

100

10

U-234

5

50

100

10

Th-230

5

50

100

10

Ra-226+

5

50

100

10

Pb-210+

100

1000

100

200

Po-210

100

1000

100

200

U-235sec

5

50

100

10

U-235+

5

50

100

10

Pa-231

5

50

100

10

Ac-227+

5

50

100

10

Th-232sec

5

50

100

10

Th-232

5

50

100

10

Ra-228+

5

50

100

10

Th-228+

5

50

100

10

2

The summation rule in respect of columns 2 and 5 of Table 4A is the sum of the quotients A/B where—

a

“A” means the concentration of each radionuclide listed in column 1 of Table 4A that is present in the substance or article; and

b

“B” means the concentration of that radionuclide specified in column 2 or 5 (as appropriate) of Table 4A.

3

The summation rule in respect of columns 3 and 4 of Table 4A is the sum of the quotients C/D where—

a

“C” means the quantity of each radionuclide listed in column 1 of Table 4A that is present in the substance or article; and

b

“D” means the quantity of that radionuclide specified in column 3 or 4 (as appropriate) of Table 4A.

Table 526

1

The Table 5 referred to in Sections 2 and 4 of this Part is—

Table 5Radionuclides: values of quantities and concentrations

Radionuclides

Maximum quantity of radioactivity (Bq) on any premises

Maximum concentration (Bq/g)

H-3

109

106

Be-7

107

103

C-14

107

104

O-15

109

102

F-18

106

10

Na-22

106

10

Na-24

105

10

Si-31

106

103

P-32

105

103

P-33

108

105

S-35

108

105

Cl-36

106

104

Cl-38

105

10

Ar-37

108

106

Ar-41

109

102

K-42

106

102

K-43

106

10

Ca-45

107

104

Ca-47

106

10

Sc-46

106

10

Sc-47

106

102

Sc-48

105

10

V-48

105

10

Cr-51

107

103

Mn-51

105

10

Mn-52

105

10

Mn-52m

105

10

Mn-53

109

104

Mn-54

106

10

Mn-56

105

10

Fe-52

106

10

Fe-55

106

104

Fe-59

106

10

Co-55

106

10

Co-56

105

10

Co-57

106

102

Co-58

106

10

Co-58m

107

104

Co-60

105

10

Co-60m

106

103

Co-61

106

102

Co-62m

105

10

Ni-59

108

104

Ni-63

108

105

Ni-65

106

10

Cu-64

106

102

Zn-65

106

10

Zn-69

106

104

Zn-69m

106

102

Ga-72

105

10

Ge-71

108

104

As-73

107

103

As-74

106

10

As-76

105

102

As-77

106

103

Se-75

106

102

Br-82

106

10

Kr-74

109

102

Kr-76

109

102

Kr-77

109

102

Kr-79

105

103

Kr-81

107

104

Kr-83m

1012

105

Kr-85

104

105

Kr-85m

1010

103

Kr-87

109

102

Kr-88

109

102

Rb-86

105

102

Sr-85

106

102

Sr-85m

107

102

Sr-87m

106

102

Sr-89

106

103

Sr-90+

104

102

Sr-91

105

10

Sr-92

106

10

Y-90

105

103

Y-91

106

103

Y-91m

106

102

Y-92

105

102

Y-93

105

102

Zr-93+

107

103

Zr-95

106

10

Zr-97+

105

10

Nb-93m

107

104

Nb-94

106

10

Nb-95

106

10

Nb-97

106

10

Nb-98

105

10

Mo-90

106

10

Mo-93

108

103

Mo-99

106

102

Mo-101

106

10

Tc-96

106

10

Tc-96m

107

103

Tc-97

108

103

Tc-97m

107

103

Tc-99

107

104

Tc-99m

107

102

Ru-97

107

102

Ru-103

106

102

Ru-105

106

10

Ru-106+

105

102

Rh-103m

108

104

Rh-105

107

102

Pd-103

108

103

Pd-109

106

103

Ag-105

106

102

Ag-108m+

106

10

Ag-110m

106

10

Ag-111

106

103

Cd-109

106

104

Cd-115

106

102

Cd-115m

106

103

In-111

106

102

In-113m

106

102

In-114m

106

102

In-115m

106

102

Sn-113

107

103

Sn-125

105

102

Sb-122

104

102

Sb-124

106

10

Sb-125

106

102

Te-123m

107

102

Te-125m

107

103

Te-127

106

103

Te-127m

107

103

Te-129

106

102

Te-129m

106

103

Te-131

105

102

Te-131m

106

10

Te-132

107

102

Te-133

105

10

Te-133m

105

10

Te-134

106

10

I-123

107

102

I-125

106

103

I-126

106

102

I-129

105

102

I-130

106

10

I-131

106

102

I-132

105

10

I-133

106

10

I-134

105

10

I-135

106

10

Xe-131m

104

104

Xe-133

104

103

Xe-135

1010

103

Cs-129

105

102

Cs-131

106

103

Cs-132

105

10

Cs-134m

105

103

Cs-134

104

10

Cs-135

107

104

Cs-136

105

10

Cs-137+

104

10

Cs-138

104

10

Ba-131

106

102

Ba-140+

105

10

La-140

105

10

Ce-139

106

102

Ce-141

107

102

Ce-143

106

102

Ce-144+

105

102

Pr-142

105

102

Pr-143

106

104

Nd-147

106

102

Nd-149

106

102

Pm-147

107

104

Pm-149

106

103

Sm-151

108

104

Sm-153

106

102

Eu-152

106

10

Eu-152m

106

102

Eu-154

106

10

Eu-155

107

102

Gd-153

107

102

Gd-159

106

103

Tb-160

106

10

Dy-165

106

103

Dy-166

106

103

Ho-166

105

103

Er-169

107

104

Er-171

106

102

Tm-170

106

103

Tm-171

108

104

Yb-175

107

103

Lu-177

107

103

Hf-181

106

10

Ta-182

104

10

W-181

107

103

W-185

107

104

W-187

106

102

Re-186

106

103

Re-188

105

102

Os-185

106

10

Os-191

107

102

Os-191m

107

103

Os-193

106

102

Ir-190

106

10

Ir-192

104

10

Ir-194

105

102

Pt-191

106

102

Pt-193m

107

103

Pt-197

106

103

Pt-197m

106

102

Au-198

106

102

Au-199

106

102

Hg-197

107

102

Hg-197m

106

102

Hg-203

105

102

Tl-200

106

10

Tl-201

106

102

Tl-202

106

102

Tl-204

104

104

Pb-203

106

102

Pb-210+

104

10

Pb-212+

105

10

Bi-206

105

10

Bi-207

106

10

Bi-210

106

103

Bi-212+

105

10

Po-203

106

10

Po-205

106

10

Po-207

106

10

Po-210

104

10

At-211

107

103

Rn-220+

107

104

Rn-222+

108

10

Ra-223+

105

102

Ra-224+

105

10

Ra-225

105

102

Ra-226+

104

10

Ra-227

106

102

Ra-228+

105

10

Ac-228

106

10

Th-226+

107

103

Th-227

104

10

Th-228+

104

1

Th-229+

103

1

Th-230

104

1

Th-231

107

103

Th-232 sec

103

1

Th-234+

105

103

Pa-230

106

10

Pa-231

103

1

Pa-233

107

102

U-230+

105

10

U-231

107

102

U-232+

103

1

U-233

104

10

U-234

104

10

U-235+

104

10

U-236

104

10

U-237

106

102

U-238+

104

10

U-238 sec

103

1

U-239

106

102

U-240

107

103

U-240+

106

10

Np-237+

103

1

Np-239

107

102

Np-240

106

10

Pu-234

107

102

Pu-235

107

102

Pu-236

104

10

Pu-237

107

103

Pu-238

104

1

Pu-239

104

1

Pu-240

103

1

Pu-241

105

102

Pu-242

104

1

Pu-243

107

103

Pu-244

104

1

Am-241

104

1

Am-242

106

103

Am-242m+

104

1

Am-243+

103

1

Cm-242

105

102

Cm-243

104

1

Cm-244

104

10

Cm-245

103

1

Cm-246

103

1

Cm-247

104

1

Cm-248

103

1

Bk-249

106

103

Cf-246

106

103

Cf-248

104

10

Cf-249

103

1

Cf-250

104

10

Cf-251

103

1

Cf-252

104

10

Cf-253

105

102

Cf-254

103

1

Es-253

105

102

Es-254

104

10

Es-254m

106

102

Fm-254

107

104

Fm-255

106

103

Any other radionuclide that is:

103, or the quantity given in respect of that radionuclide in the F3Public Health England publication ‘Exempt Concentrations and Quantities for Radionuclides not Included in the European Basic Safety Standards DirectiveM1.

1, or the concentration given in respect of that radionuclide in the publication referenced in column 2.

(a) not of natural terrestrial or cosmic origin, or

(b) listed in Table 2 in this Schedule.

2

The summation rule in respect of column 2 of Table 5 is the sum of the quotients A/B where—

a

A” means the quantity of each radionuclide listed in column 1 of Table 5 that is present in the material and waste, and

b

B” means the quantity of that radionuclide specified in column 2 of Table 5.

3

The summation rule in respect of F4column 3 of Table 5 is the sum of the quotients C/D where—

a

C” means the concentration of each radionuclide listed in column 1 of Table 5 that is present in the material and waste, and

b

D” means the concentration of that radionuclide specified in column 3 of Table 5.

Table 627

The Table 6 referred to in Sections 5 and 7 of this Part is—

Table 6Radioactive waste: values of quantities and concentrations

Radioactive waste

Maximum concentration of radionuclides

Maximum quantity of radioactivity to be disposed of in the period stated

Solid radioactive waste, with no single item > 4 x 104 Bq

4 x 105 Bq for the sum of all radionuclides per 0.1m3

2 x 108 Bq/year

Solid radioactive waste containing tritium and C-14 only, with no single item > 4 x 105 Bq

4 x 106 Bq of tritium and C-14 per 0.1m3

2 x 109 Bq/year

Individual sealed sources

2 x 105 Bq for the sum of all radionuclides per 0.1m3

1 x 107 Bq/year

Individual sealed sources which are solely radioactive waste because they contain tritium

2 x 1010 Bq of tritium per 0.1m3

1 x 1013 Bq/year

Luminised articles with no single item containing > 8 x 107 Bq of Pm-147 or > 4 x 109 of tritium

8 x 107 Bq per 0.1m3 of Pm-147

2 x 109 Bq/year of Pm-147

or 4 x 109 Bq per 0.1m3 for tritium

or 1 x 1011 Bq/year of tritium

Solid radioactive waste which consists of magnesium alloy, thoriated tungsten or dross from hardener alloy in which the thorium concentration does not exceed 4% by mass

No limit

No limit

Solid uranium or thorium compound

No limit

0.5kg of uranium or thorium per week

Aqueous liquid uranium or thorium compound

No limit

0.5kg of uranium or thorium per year

Aqueous liquid human excreta

No limit

1 x 1010 Bq/year of Tc-99m

and

5 x 109 Bq/year for the sum of all other radionuclides

Table 728

1

The Table 7 referred to in Section 7 of this Part is—

Table 7Aqueous radioactive waste values

Radionuclide

Concentration in Bq/ litre

Maximum annual quantity of radionuclides to a relevant sewer (Bq/ year)

Maximum annual quantity of radionuclides directly into a relevant river or the sea (Bq/ year)

H-3

103

1010

1010

Be-7

1

107

107

C-14

0.1

106

106

F-18

0.1

106

106

Na-22

1

106

107

Na-24

1

107

107

Si-31

10

108

108

P-32

0.001

104

104

P-33

0.001

104

104

S-35

10

3 x 107

108

Cl-36

10

107

108

Cl-38

0.1

106

106

K-42

0.01

105

105

K-43

0.01

105

105

Ca-45

1

107

107

Ca-47

0.1

106

106

Sc-46

0.001

104

104

Sc-47

0.01

105

105

Sc-48

0.001

104

104

V-48

1

107

107

Cr-51

10

108

108

Mn-51

0.001

104

104

Mn-52

0.001

104

104

Mn-52m

0.001

104

104

Mn-53

1

107

107

Mn-54

0.01

105

105

Mn-56

0.001

104

104

Fe-52

0.01

105

105

Fe-55

1

107

107

Fe-59

0.01

105

105

Co-55

0.001

104

104

Co-56

0.001

104

104

Co-57

0.1

106

106

Co-58

0.1

106

106

Co-58m

1

107

107

Co-60

0.01

105

105

Co-60m

1

107

107

Co-61

0.1

106

106

Co-62m

0.001

104

104

Ni-59

1

107

107

Ni-63

102

109

109

Ni-65

0.01

105

105

Cu-64

0.1

106

106

Zn-65

0.1

3 x 105

106

Zn-69

10

108

108

Zn-69m

0.1

106

106

Ga-67

0.1

106

106

Ga-72

0.001

104

104

Ge-71

1

107

107

As-73

10

108

108

As-74

1

107

107

As-76

1

107

107

As-77

1

107

107

Se-75

0.1

3 x 105

106

Br-82

0.1

106

106

Rb-86

0.1

106

106

Sr-85

0.1

106

106

Sr-85m

0.1

106

106

Sr-87m

0.1

106

106

Sr-89

1

107

107

Sr-90+

0.1

3 x 105

106

Sr-91

0.01

105

105

Sr-92

0.01

105

105

Y-90

1

107

107

Y-91

1

107

107

Y-91m

0.01

105

105

Y-92

0.1

106

106

Y-93

0.1

106

106

Zr-93

10

108

108

Zr-95+

0.001

104

104

Zr-97

0.01

105

105

Nb-93m

10

108

108

Nb-94

0.1

106

106

Nb-95

1

107

107

Nb-97

1

107

107

Nb-98

0.1

106

106

Mo-90

0.1

106

106

Mo-93

1

107

107

Mo-99

0.1

106

106

Mo-101

0.01

105

105

Tc-96

1

107

107

Tc-96m

102

109

109

Tc-97

102

109

109

Tc-97m

10

108

108

Tc-99

10

107

108

Tc-99m

10

3 x 107

108

Ru-97

0.01

105

105

Ru-103

0.01

105

105

Ru-105

0.01

105

105

Ru-106+

0.1

106

106

Rh-103m

10

108

108

Rh-105

1

107

107

Pd-103

0.1

106

106

Pd-109

0.1

106

106

Ag-105

1

107

107

Ag-108m

0.1

106

106

Ag-110m

0.1

106

106

Ag-111

10

108

108

Cd-109

1

107

107

Cd-115

0.1

106

106

Cd-115m

1

107

107

In-111

0.01

105

105

In-113m

0.01

105

105

In-114m

0.01

105

105

In-115m

0.01

105

105

Sn-113

0.1

106

106

Sn-125

0.01

105

105

Sb-122

0.1

106

106

Sb-124

0.1

106

106

Sb-125

1

107

107

Te-123m

1

107

107

Te-125m

1

107

107

Te-127

10

108

108

Te-127m

1

107

107

Te-129

10

108

108

Te-129m

1

107

107

Te-131

1

107

107

Te-131m

1

107

107

Te-132

0.1

106

106

Te-133

1

107

107

Te-133m

1

107

107

Te-134

1

107

107

I-123

1

107

107

I-125

1

107

107

I-126

0.1

106

106

I-129

0.1

106

106

I-130

0.1

106

106

I-131

0.1

106

106

I-132

0.1

106

106

I-133

0.1

106

106

I-134

0.1

106

106

I-135

0.1

106

106

Cs-129

0.01

105

105

Cs-131

0.1

106

106

Cs-132

0.01

105

105

Cs-134

0.01

105

105

Cs-134m

0.1

106

106

Cs-135

0.1

106

106

Cs-136

0.001

104

104

Cs-137+

0.01

105

105

Cs-138

0.001

104

104

Ba-131

0.1

106

106

Ba-140

0.1

106

106

La-140

0.001

104

104

Ce-139

0.1

106

106

Ce-141

0.1

106

106

Ce-143

0.01

105

105

Ce-144

0.1

106

106

Pr-142

0.1

106

106

Pr-143

10

108

108

Nd-147

0.01

105

105

Nd-149

0.01

105

105

Pm-147

10

108

108

Pm-149

1

107

107

Sm-151

102

109

109

Sm-153

0.1

106

106

Eu-152

0.01

105

105

Eu-152m

0.01

105

105

Eu-154

0.01

105

105

Eu-155

0.1

106

106

Gd-153

0.1

106

106

Gd-159

0.1

106

106

Tb-160

0.01

105

105

Dy-165

0.1

106

106

Dy-166

0.1

106

106

Ho-166

0.1

106

106

Er-169

10

108

108

Er-171

0.01

105

105

Tm-170

1

107

107

Tm-171

10

108

108

Yb-175

0.1

106

106

Lu-177

0.1

106

106

Hf-181

0.01

105

105

Ta-182

0.001

104

104

W-181

0.1

106

106

W-185

1

107

107

W-187

0.01

105

105

Re-186

1

107

107

Re-188

1

107

107

Os-185

0.01

105

105

Os-191

0.1

106

106

Os-191m

1

107

107

Os-193

0.1

106

106

Ir-190

0.001

104

104

Ir-192

0.01

105

105

Ir-194

0.1

106

106

Pt-191

0.01

105

105

Pt-193m

1

107

107

Pt-197

0.1

106

106

Pt-197m

0.1

106

106

Au-198

1

107

107

Au-199

1

107

107

Hg-197

1

107

107

Hg-197m

0.1

106

106

Hg-203

0.1

106

106

Tl-200

0.01

105

105

Tl-201

0.1

106

106

Tl-202

0.01

105

105

Tl-204

0.1

106

106

Pb-203

0.01

105

105

Pb-210

0.001

104

104

Pb-212

0.1

106

106

Bi-206

0.01

105

105

Bi-207

0.1

106

106

Bi-210

10

108

108

Bi-212

1

107

107

Po-203

0.001

104

104

Po-205

0.001

104

104

Po-207

0.001

104

104

Po-210

0.001

104

104

At-211

1

107

107

Ra-223

0.01

105

105

Ra-224+

0.01

105

105

Ra-225

0.01

105

105

Ra-226+

0.01

105

105

Ra-227

1

107

107

Ra-228

0.01

105

105

Ac-227

0.1

106

106

Ac-228

0.001

104

104

Th-226

0.1

106

106

Th-227

0.01

105

105

Th-228

1

107

107

Th-229

0.01

105

105

Th-230

1

107

107

Th-231

0.1

106

106

Th-232

1

106

107

Th-234

0.1

106

106

Pa-230

0.01

105

105

Pa-231

0.01

105

105

Pa-233

0.1

106

106

U-230

0.1

106

106

U-231

10

108

108

U-232

0.1

106

106

U-233

0.1

106

106

U-234

0.1

106

106

U-235+

0.1

106

106

U-236

0.1

106

106

U-237

10

108

108

U-238+

0.1

106

106

U-239

10

108

108

U-240

10

108

108

Np-237

0.1

106

106

Np-239

1

107

107

Np-240

0.1

106

106

Pu-234

0.01

105

105

Pu-235

0.01

105

105

Pu-236

1

107

107

Pu-237

0.1

106

106

Pu-238

0.1

106

106

Pu-239

0.1

106

106

Pu-240

0.1

106

106

Pu-241

10

108

108

Pu-242

0.1

106

106

Pu-243

0.1

106

106

Pu-244

0.1

106

106

Am-241

0.1

106

106

Am-242

0.1

106

106

Am-242m

0.1

106

106

Am-243

0.1

106

106

Cm-242

1

107

107

Cm-243

0.1

106

106

Cm-244

0.1

106

106

Cm-245

0.01

105

105

Cm-246

0.1

106

106

Cm-247

0.01

105

105

Cm-248

0.1

106

106

Bk-249

102

109

109

Cf-246

1

107

107

Cf-248

1

107

107

Cf-249

0.01

105

105

Cf-250

0.1

106

106

Cf-251

0.01

105

105

Cf-252

0.1

106

106

Cf-253

10

108

108

Cf-254

0.0001

103

103

Es-253

1

107

107

Es-254

0.1

106

106

Es-254m

0.01

105

105

Fm-254

1

107

107

Fm-255

0.1

106

106

Any other radionuclide that is not of natural terrestrial or cosmic origin

0.0001

103

103

or that concentration which gives rise to a dose to a member of the public of 10 microsieverts per year calculated in accordance with the methodology used to calculate other concentrations in this table M2.

or that quantity which corresponds to 3,000m3 of aqueous radioactive waste up to the appropriate concentration as calculated in accordance with column 2.

or that quantity which corresponds to 10,000m3 of aqueous radioactive waste up to the appropriate concentration as calculated in accordance with column 2.

2

The summation rule in respect of column 2 of Table 7 is the sum of the quotients A/B where—

a

A” means the concentration in Bq/ litre of each radionuclide listed in column 1 of Table 7 that is present in aqueous waste which is not described in a row in column 1 of Table 6, and

b

B” means the concentration of that radionuclide specified in column 2 of Table 7.

3

The summation rule in respect of column 3 of Table 7 is the sum of the quotients C/D where—

a

C” means the quantity in Bq of each radionuclide listed in column 1 of Table 7 that is present in the aqueous waste which is not described in a row in column 1 of Table 6 which is disposed of in the year, and

b

D” means the quantity of that radionuclide specified in column 3 of Table 7.

4

The summation rule in respect of column 4 of Table 7 is the sum of the quotients C/E where—

a

C” means the quantity in Bq of each radionuclide listed in column 1 of Table 7 that is present in the aqueous waste which is not described in a row in column 1 of Table 6 which is disposed of in the year, and

b

E” means the quantity of that radionuclide specified in column 4 of Table 7.

Annotations:
Marginal Citations
M2

The concentrations in this table were calculated using methods adopted by the Health Protection Agency in their document HPA-CRCE-005 - Derivation of Liquid Exclusion or Exemption Levels to Support the RSA93 Exemption Order Review, published in Chilton, Oxfordshire in August 2010 (ISBN 0-978-85951-673-0).

Interpretation of this Section29

In this Section, where any radionuclide carries the suffix “+” or “sec”—

a

that radionuclide represents the parent radionuclide in secular equilibrium with the corresponding daughter radionuclides which are identified in column 2 of Table 8 adjacent to that parent radionuclide, and

b

a concentration or activity value given in respect of such a parent radionuclide is the value for the parent radionuclide alone, but already takes into account the daughter radionuclides in column 2 that are present.

Table 830

The Table 8 referred to in paragraph 29 is—

Table 8Radionuclides in secular equilibrium

Parent radionuclide

Daughter radionuclides

Sr-90+

Y-90

Zr-93+

Nb-93m

Zr-95+

Nb-95

Zr-97+

Nb-97

Ru-106+

Rh-106

Ag-108m+

Ag-108

Cs-137+

Ba-137m

Ba-140+

La-140

Ce-144+

Pr-144

Pb-210+

Bi-210, Po-210

Pb-212+

Bi-212, Tl-208, Po-212

Bi-212+

Tl-208, Po-212

Rn-220+

Po-216

Rn-222+

Po-218, Pb-214, Bi-214, Po-214

Ra-223+

Rn-219, Po-215, Pb-211, Bi-211, Tl-207

Ra-224+

Where Ra-224+ is referred to in Table 5: Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212

Where Ra-224+ is referred to in Table 7: Pb-212

Ra-226+

Where Ra-226+ is referred to in F5Table 4A and Table 5: Rn-222, Po-218, Pb-214, Bi-214, F6Po-214, Pb-210, Bi-210, Po-210

Where Ra-226+ is referred to in Table 7: Rn-222, Po-218, Pb-214, Bi-214, Po-214

Ra-228+

Ac-228

Th-226+

Ra-222, Rn-218, Po-214

Th-228+

Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Po-212, Tl-208

Th-229+

Ra-225, Ac-225, Fr-221, At-217, Bi-213, Po-213, Pb-209

Th-232 sec

Ra-228, Ac-228, Th-228, Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Po-212, Tl-208

Th-234+

Pa-234m

U-230+

Th-226, Ra-222, Rn-218, Po-214

U-232+

Th-228, Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212

U-235+

Th-231

U-238+

Th-234, Pa-234m, Pa-234

U-238 sec

Th-234, Pa-234m, U-234, Th-230, Ra-226, Rn-222, Po-218, Pb-214, Bi-214F7, Po-214, Pb-210, Bi-210, Po-210

U-240+

Np-240

Np-237+

Pa-233

Am-242m+

Am-242

Am-243+

Np-239