IAEA-TECDOC-8S5. Clearance levels
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1 IAEA-TECDOC-8S5 Clearance levels
2 The IAEA does
3 The originating Section of this publication in the IAEA was: Waste Management Section International Atomic Energy Agency Wagramerstrasse
4 ALL PLEASE BE AWARE THAT
5 Radioactive waste FOREWORD
6
7 CONTENTS 1. INTRODUCTION... 1 Background... l Objective... 2 Scope... 2 Structure EXEMPTION
8 APPENDIX II: COLLECTIVE DOSE CONSIDERATIONS ANNEX: CONCENTRATIONS OF NATURALLY OCCURRING RADIONUCLIDES
9 1. INTRODUCTION BACKGROUND 101. Many uses of radioactive materials are beneficial to mankind, for example, in electric power production, in cancer treatment, and in medical diagnosis. However, radioactive materials are also potentially harmful to health and their use must therefore be regulated. The accepted regulatory approach is based on a system of notification
10 fuel cycle which include specifications for clearance, but in most cases clearance from regulations
11 radiation sources, contaminated land
12
13 INTERNATIONAL GUIDANCE
14 to natural background radiation, to the extent that it is normal and unavoidable, as
15 APPLICATION OF CLEARANCE PRINCIPLES The need for derived quantities 212. The guiding radiological criteria for exemption and clearance are expressed in terms
16 radiological properties. However, the removal of restrictions may not always be complete; there is also the possibility of clearing material under specified conditions. The application of conditions ensures that conditional releases will also provide an adequate degree
17 group exposure due to overlapping practices should be taken into account in interpreting
18 reviewed assessments, or components of them, were judged, in the context of the present study, to be: incomplete, with important exposure scenarios missing; unrealistic, because of the assumptions made. In such cases, the data were excluded from further consideration. 304.
19 TABLE I. DERIVED UNCONDITIONAL CLEARANCE LEVELS Ranges of activity concentration (Bq/g) 0.1 <1.0 fcl.0 <10,10 <100 >100 <1000 >1000 < Na-22 Na-24 Mn-54 Co-60 Zn-65 Nb-94 Ag-110m Sb-124 Co-58 Fe-59 Sr-90 Ru-106 Cr-51 Co-57 Tc-99m C-14 P-32 Cl-36 Fe-55 H-3 S-35 Ca-45 Radionuclides a Cs-134 U-234 Cs-137 U-235
20 (d) In the absence of other guidance, the clearance level values for surface contamination (Bq/cm 2 )
21 4. VERIFICATION OF CLEARANCE LEVELS 401. From a regulatory viewpoint, it is necessary to be able to verify that the cleared material conforms to the applicable clearance levels. This can be done by direct measurement on the material in question, by laboratory measurements on representative samples, by the use of properly derived scaling factors or by other means which are accepted by the competent national authority The goal of keeping individual doses below about 10 pisv/a implies that dose rates have to be detected which are a small fraction of natural background and so it is necessary to operate at the limits of detectability. MEASUREMENT METHODS 403. A number of publications exist dedicated fully or partially to the measurement methods, devices
22 ance levels by deliberately adding relatively high specific activity materials to low activity
23 levels. The Annex presents data on measured levels of some commonly occurring radionuclides and shows that it may be difficult to distinguish artificially enhanced levels from variations in the natural background levels of radiation (see also paras ). 5. REGULATORY ASPECTS REGULATORY METHODS 501. Two mechanisms can be envisaged for including clearance criteria within a regulatory framework:
24
25 'average' natural level and, in some cases, on judging whether there is any real enhancement (see also para. 410) It is clear that the application of clearance concepts to materials contaminated with naturally occurring radionuclides is not straightforward and some interpretation
26 Appendix
27 (Similar groups emissions use of slag
28 TABLE 1.1. SUMMARY OF RESULTS OF STUDIES ON CLEARANCE LEVELS
29 TABLE 1.1. (cont.) T
30 1.7. Comparison of the results of the assessment with those of other similar landfill assessments shows that the 'landfill residential scenario' gives clearance levels at least
31 Sumerling
32 time-scale
33 The results of Harvey et al. have been excluded from the subsequent analysis in paras 1.37
34 TABLE 1.2. SUMMARY
35 TABLE 1.2. (cont.)
36 1.23. This study evaluates
37 U) O TABLE I.3. SUMMARY
38 u> Sr-90
39 U) N> TABLE 1.3. (cont.) Steel Aluminium Radionuclide IAEA" CEC b Eiert et al. IAEA 3 Garba y [4] [H] [30] [4] Ct a [3 2] Ra-226 Ra-228 U-234 U-235 U-238 Np-237 Pu-239 Pu-240 Pu-241 Am-241 Cm x 10 1
40 Harisîoy
41 TABLE 1.4. SUMMARY OF RESULTS OF STUDIES ON CLEARANCE LEVELS FOR REUSE Bq/g Radionuclide H-3 C-14 Na-22 Na-24 P-32 S-35 Cl-36 Ca-45 Cr-51 Mn-54 Fe-55 Fe-59 Co-57 Co-58 Co-60 Ni-63 Zn-65 Sr-89 Sr-90 Y-90 Nb-94 Tc-99m Tc-99 Ru-106 Ag-110m Cd- 109 In-Ill Sb-124 IAEA" NUREG a [4] [34] 1 x x
42 TABLE 1.4. (cont.) Bq/g Radionuclide IAEA 8 NUREG 3 [4] [34] Cs-134 Cs-137 Ce- 144 Pm-147 Eu- 152 Ir-192 Au-198 Tl-201 Pb-210 Po-210 Th-228 Th-230 Th-232 Ra-226 Ra-228 U-234 U-235 U-238 Np-237 Pu-239 Pu-240 Pu-241 Am-241 Cm x
43 Haristoy et al. [33] Clearance levels for surface contamination are derived for the reuse of buildings as offices. The radiological criterion used as the basis for the clearance levels was 50 jisv/a. The values have been normalized to a basis of 10 /*Sv/a. The dosimetry is based on ICRP 60 [12]. NUREG [34] This report
44 TABLE 1.5. SUMMARY
45 TABLE 1.5. (cont.) Radionuclide Eu- 152 Ir-192 Au- 198 Tl-201 Pb-210 Pô-210 Th-228 Th-230 Th-232 Ra-226 Ra-228 U-234 U-235 U-238 Np-237 Pu-239 Pu-240 Pu-241 Am-241 Cm-244 Bq/g 5 x 10
46 DERIVATION
47 TABLE 1.6. RANGES OF RESULTS OBTAINED FROM LANDFILL, INCINERATION, RECYCLING AND REUSE ANALYSES (Bq/g) Radionuclide H-3 C-14 Na-22 Na-24 P-32 S-35 Cl-36 Ca-45 Cr-51 Mn-54 Fe-55 Fe-59 Co-57 Co-58 Co-60 Ni-63 Zn-65 Sr-89 Sr-90 Y-90 Nb-94 Tc-99m Tc-99 Ru-106 Ag-110m Cd-
48 TABLE 1.6. (cont.) Range Low Ce- 144 Pm-147 Eu- 152 Ir-192 Au-198 Tl-201 Pb-210 Pô-210 Th-228 Th-230 Th-232 Ra-226 Ra-228 U-234 U-235 U-238 Np-237 Pu-239 Pu-240 Pu-241 Am-241 Cm-244 6
49 1.43. In some scenarios involving beta emitters, the dominant exposure pathway is expected to be due to skin dose. In only a few of the studies used to develop the categories was skin dose considered. The skin doses that might be delivered by beta emitters were evaluated by comparing the appropriate representative activity concentrations in Table 1.7 with the activity concentrations given by Harvey et al. [37], which did consider skin doses. It was found that, at these representative activity concentrations,
50 TABLE 1.7. APPLICATION
51 TABLE 1.7. (cont.) Radionuclide Pm-147 Eu- 152 Ir-192 Au-
52 1.50.
53 Appendix
54
55 Annex CONCENTRATIONS OF NATURALLY OCCURRING RADIONUCLIDES IN COMMON MATERIALS A-l.
56 TABLE A-III. WORLDWIDE RANGES
57 TABLE A-IV. ORES ACTIVITY CONCENTRATIONS MEASURED IN ADDITIONAL
58 TABLE A-V. ACTIVITY CONCENTRATIONS MEASURED IN METAL MINING AND PROCESSING WASTES (Bq/g) Material Notes Red mud Brown mud Furnace slag Tailings Bauxite refinery waste 3 Bauxite refinery waste 3 Copper smelting waste 6 Copper mining waste 6 Leach material Copper mining waste Surface waste
59 TABLE A-VI. REPORTED RANGES OF ACTIVITY CONCENTRATIONS IN PHOSPHATE FERTILIZERS (Bq/g) a Type
60 TABLE A-Vn. ACTIVITY CONCENTRATIONS MEASURED
61 TABLE A-Vm. ACTIVITY CONCENTRATIONS MEASURED IN CONSTRUCTION MATERIALS (Bq/g) a [40] Country Material K-40 U-238 Ra-226 Th-232 China (Taiwan) Wood Red brick Concrete UK Clay brick Silicate brick (gravel) Granite Aerated concrete Natural gypsum Concrete block (fly ash) ( ) ( ) ( ) ( ) USA Cement Silica sand Commercial sand Red brick Silica brick Light concrete Granite Sand (< ) <0.015 Germany Cement Granite Brick Sand, gravel Cement Natural gypsum Concrete < < < < <0.019 < < Values
62 REFERENCES
63 [16] HOLOWAY, C.F., WITHERSPOON, J.P., DICKSON, H.W., LANTZ, P.M., WRIGHT,
64 [29] POSCHNER, J., SCHALLER, G., WIRTH, E., Verbesserung und Neuentwicklung von radiologischen Modellen
65 [43] STRANDEN,
66 GLOSSARY The IAEA published a Radioactive Waste Management Glossary as IAEA- TECDOC-264 (1982) and a second edition as IAEA-TECDOC-447 (1988). Over the years, continuing developments
67 decommissioning. Actions taken at the end of the useful life of a nuclear facility in retiring it from service with adequate regard for the health and safety of work-
68 exclusion (from regulatory control).
69 licence. A formal, legally prescribed document issued to the applicant (i.e. operating organization) by the regulatory body to perform specified activities related to the siting, design, construction, commissioning, operation, decommissioning of a nuclear facility, closure of a disposal facility, closeout of a mining and mill tailings site, or institutional control. (See also authorization.) practice.
70 sealed source. A radioactive source designed in such a form that the probability of dispersion of its radioactive contents is extremely low. Sealed sources may be used, for example, in teletherapy and brachytherapy, and in scientific devices which contain radioactive substances, as well as in a number of medical and industrial applications. source.
71 Baekelandt, CONTRIBUTORS TO DRAFTING AND REVIEW
72 Roles, G. Ruokola,
73 Extended INWAC Meeting Vienna, Austria: May 1995 Ajuria Garza, S. Beceiro, A.R. Bogdan,
74 Palacios, C. Poliakov, A.S. Porter, I. Prasad, A.N. Röthemeyer,
75 QUESTIONNAIRE
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