Copyright © 2014 ALLIANCE Updates to the ERICA Tool Barcelona – 10 th September 2014 Nick...

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Updates to the ERICA Tool

Barcelona – 10th September 2014

www.er-alliance.org

Nick Beresford & Justin Brown

nab@ceh.ac.uk (NERC-CEH, UK)

ERICA Tool updates

Since 2007 release have been updatesTypically addressing ‘bugs’

The 2014 release will have more substantial updatesDefault radionuclidesCR & kd values revised

Reference organismsEMCL values

ERICA Tool updates

Radionuclides

Added:Ba-140, Ca-45, Cr-51, Cf-252, Ir-192, La-140, Pa-231 & Zn-65

ERICA now consistent with ICRP (Publication 108 & 114) radionuclide lists for their developing RAP approach

CRs, kds, DCC & EMCLs generated for the new default radionuclides

Added freshwater reptile There are European protected freshwater

reptile species

Removed bird eggLack of CR values and inconsistent with other

organisms

Marine macroalgae – geometry now consistent with ICRP 108 (increase in mass from 0.0065 kg to 0.652 kg)

Reference organisms

Some changes in naming

Transfer parameters

December 2013 version of Wildlife Transfer Database used to revise ERICA ToolHave used data at broad wildlife group level – no

justification to use more refined categories on basis of analyses conducted to date

Transfer parameters

c. 1500 CR values required for the ERICA Tool

CRwo-media – what’s changed

Wildlife Transfer Database

• On-line CR database compiled - initially under remit of IAEA EMRAS WG

Evolution to the IAEA/ICRP

New & review data

USDOE R&D128

FASSET

IAEA 422

WildlifeDatabase

Canadian U-mine industryCOG monitoring dataRussian language literatureSKB reportsJapanese estuariesAustralian dataData from new studies Post ERICA literature review ........ and more

ICRP 114 & IAEA TRS

86979 CRwo values24883 CRwo-sediment

71 elements

Publications

See JER website for others ‘analysing’ database &

Evolution since 2011

WildlifeDatabase

ICRP 114 & IAEA TRS

86979 CRwo values24883 CRwo-sediment

c. 17,000 additional CR values added (>80 elements)

Barnett et al in-press ‘UK RAP site’Sheppard studies CanadaNIRS estuarine dataUSA plant and invertebrate data (Napier)Review of Australian data (Hirth/Johansen)US weapons test sites Pu data (Johansen)STUK monitoring dataPost 2011 literature (not comprehensive)

QCRepeat entriesOutliers investigatedConversion errors

ERICA revision

Some refs outBUT ID

numbers will not be reused

http://www.wildlifetransferdatabase.org/

Transfer parameters – ERICA Tool

c. 1500 CR values required for ERICA ToolApproximately 50% derived from empirical data Extrapolation/Guidance approaches to provide missing

data still required

kd received less attention than CR

Tried to minimise previous use of marine kds in freshwater ecosystems

Extrapolation in ERICA 2014

Option 10 – includes approaches to derive pdf (mean and standard deviation)

Will change in ERICA 2014 version

Option 10 – includes approaches to derive missing pdfs (mean and standard deviation)

Information on how derived is given in Tool

Data for elements not included in Tool used to derive default values for options 4 & 5 where appropriate (e.g. Cu used to provide some Ag CR values)

Example changes in CR

Arthro

ritivo

Reptile

CR Terrestrial (Cs)

Provisional

Arthro

ritivo

Reptile

CR Terrestial (Po) Provisional

Freshwater CR (Ra)

ic fis

- biva

Pelagic

Zoopla

Reptile

Freshwater CR (U)Provisional

CR Marine (Am)

Example changes in Kd

Ag Am C Cd Ce Cl Cm Co Cs Eu H I Mn Nb Ni Np P Pb Po Pu Ra Ru S Se Sr Tc Te Th U Zr

Marine Kd

Example changes in Kd

Ag Am C Cd Ce Cl Cm Co Cs Eu H I Mn Nb Ni Np P Pb Po Pu Ra Ru S Sb Se Sr Tc Te Th U Zr

1E+8Freshwater Kd

Provisional

Distributions CR and kd

Where an SD available then lognormal distribution assumedOriginal ERICA Tool assumed exponential distributions

when no SD value for CR or kd

data extrapolation approach used to derive CR valueThis did not make best use of available information and can

likely lead to some extreme EMCL estimates For revised Tool database

Tried to derive default SD values when not available and hence assume lognormal & not exponential distributions

Marine kd – distribution change e.g. Ag

Corrections in Tool

Terrestrial amphibian and reptile – default occupancy now 100% in soil

Lichen & bryophytes – all external DCCs recalculated

Revised EMCL values

The EMCL is the media activity concentration that gives rise to the screening dose rate (10 µGy/h) to the most exposed organism – used in Tier 1

All need to be recalculated using revised parameters (kd & CR (+ associated pdfs), occupancy, DCCs)

Revised EMCL values - terrestrial

Ag-110m

Cd-109

Ce-141

Ce-144

Cs-134

Cs-135

Cs-136

Cs-137

Eu-152

Eu-154

Np-237

Pb-210

Po-210

Pu-238

Pu-239

Pu-240

Pu-241

Ra-226

Ra-228

Ru-103

Ru-106

Sb-124

Sb-125

Te-129m

Te-132

Th-227

Th-228

Th-230

Th-231

Th-232

Th-234

Provisional

Revised EMCL values

Ag-110m

Cd-109

Ce-141

Ce-144

Cs-134

Cs-135

Cs-136

Cs-137

Eu-152

Eu-154

Np-237

Pb-210

Po-210

Pu-238

Pu-239

Pu-240

Pu-241

Ra-226

Ra-228

Ru-103

Ru-106

Sb-124

Sb-125

Te-129m

Te-132

Th-227

Th-228

Th-230

Th-231

Th-232

Th-234

Marine water

Provisional

Revised EMCL values

1E+6Marine sediment

Revised EMCL values

1.00E-04

1.00E-02

1.00E+00

1.00E+02

1.00E+04

1.00E+06

1.00E+08

Freshwater - water

Revised EMCL values

Freshwater - sedimentProvisional

Benchmarks

40 µGy/h will apply to aquatic mammals & birds

Tier 2 – uncertainty factors

Current UF values of 3 and 5 usedIntended to approximate 95th and 99th%ile RQs

Paper published suggesting that these should be 7 & 28

Tier 2 – uncertainty factors

Demonstrated that UFs of 7 and 28 approximate to 97.5 and 99.5th percentiles

Future changes

Multiple site/time entry functionality Revised IAEA SRS dispersion models Include ICRP DCRLs Dosimetry – half-life rules? Rn models? Noble gases? SRS approach for continuous terrestrial releases?

On-line Q&Awww.ceh.ac.uk/PROTECT/

Refresher course

Intending to run a short update course once new Tool version released under the STAR NoE

Will try to do this as webinar

To register an interest email clb@ceh.ac.uk

Note also willing to tailor course to needs (e.g. two run in Australia)

Copyright © 2014 ALLIANCE Updates to the ERICA Tool Barcelona – 10 th September 2014 Nick...

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