Presentation is loading. Please wait.

Presentation is loading. Please wait.

Centre for Ecology & Hydrology - Lancaster 1 st – 3 rd April 2014 David Copplestone & Nick Beresford.

Similar presentations


Presentation on theme: "Centre for Ecology & Hydrology - Lancaster 1 st – 3 rd April 2014 David Copplestone & Nick Beresford."— Presentation transcript:

1 Centre for Ecology & Hydrology - Lancaster 1 st – 3 rd April 2014 David Copplestone & Nick Beresford

2 “to provide and apply an integrated approach of addressing scientific, managerial and societal issues surrounding environmental effects of ionising contamination, at a community level, with emphasis on biota and ecosystems” The ERICA Tool ( ) is the freely available software which implements the ERICA integrated approach. To download Tool: Well documented: https://wiki.ceh.ac.uk/display/rpemain/ERICA+reports Considers terrestrial, freshwater and marine ecosystems

3

4 Media concentration Release Dose rate Risk Dispersion model Transfer model Dosimetry model (internal exposure) Wholebody activity concentrations Dosimetry model (external exposure) Effects understanding/ numerical benchmark

5 Clear goals shape Swedish environmental policy ………………………. The overall goal is to pass on to the next generation a society in which the major environmental problems have been solved. …………………………….

6 GOAL A condition or state desired to be brought about through a course of action program. They are usually qualitative statements that provide direction for plans and projects. Goals are not specific numerical limitations, but conditions or states which can be obtained through careful planning and implementation. The water use goal for the fishery, established by the Hamilton Harbour Stakeholder Group, is "that water quality and fish habitat should be improved to permit an edible, naturally-reproducing fishery for warm water species, and water and habitat conditions in Hamilton Harbour should not limit natural reproduction and the edibility of cold water species."

7 …….. a term which is inconsistently used! But obviously need to know what you want to protect before conducting an assessment/setting dose rate benchmarks - what is protecting the environment? …. There appears to be no internationally agreed definition. How are protection goals being defined in radiological protection/what’s driving the need for assessment ?

8  For instance (from EC PROTECT project):  To protect the sustainability of populations of the vast majority of all species and thus ensure ecosystem function now and in the future. Special attention should be given to keystone, sentinel, rare, protected or culturally significant species

9  Term stakeholders here means:  any person or organisation that could either be affected by, or interested in, the outcome of a decision  Consequently  Will vary with the objective of the assessment  May include a wide range of people (experts, lay people, elected people, volunteers, etc)

10  Identifies the:  source (of radionuclides)  receiving media  any key receptor species  assessment criteria to use  uncertainties (either knowledge or data)  Considers the  need for, and takes into account, stakeholder involvement  legislation and/or any regulatory requirements

11  Should be documented  in a transparent & understandable way  Commonly, by conceptual model  describing what is known about the site  Level of detail required  will be influenced by a number of factors

12 Media concentration Release Dose rate Risk Dispersion model Transfer model Dosimetry model (internal exposure) Wholebody activity concentrations Dosimetry model (external exposure) Effects understanding/ numerical benchmark Tier 1

13  Designed to be simple and conservative  User only needs to input media activity concentrations  Aims to identify sites of negligible concern, removed from further assessment – with a high degree of confidence  Envisaged that most sites will only need this level of assessment [i.e. ‘be screened out’]

14  Dose rate below which it is agreed (for the purposes of an assessment) that there is no requirement for further evaluation  In ERICA Tier 1 input media (soil, water, sediment) activity concentrations are compared to precalculated concentrations estimated to give rise to the screening dose rate for the most exposed organism  These are termed ‘Environmental Media Concentration Limits’ (EMCL)

15  Maximum measured or modelled media concentrations  Terrestrial ecosystem - soil (or air for a few radionuclides)  Aquatic ecosystems – water and/or sediment  If no measurements but site release estimates then Tool has simple dispersion models

16  Vast number of potential organisms to simplify a set of organisms have been selected to represent different tropic levels, organisms likely to be exposed, radiosensitive organisms, encompass all European protected species, incorporate ICRP RAPs  These are the ‘Reference Organisms’  12 freshwater, 13 terrestrial,13 marine organisms Terrestrial Amphibian Bird Bird egg Detritivorous invertebrate Flying insects Gastropod Grasses and herbs Lichen and bryophytes Mammal Reptile Shrub Soil invertebrate Tree

17 Sum of RQs adds together the RQs for the radionuclides (may be for different organisms) If RQ>1 then screening dose rate exceeded (under these conservative assumptions)

18 Tier 2 – create organism  Common Lizard characteristics: Size (cm) - 14 length x 1 width x 2 depth Weight - 10 g  Occupancy - 50% in soil/50% on soil

19 Media concentration Release Dose rate Risk Dispersion model Transfer model Dosimetry model (internal exposure) Wholebody activity concentrations Dosimetry model (external exposure) Effects understanding/ numerical benchmark

20 Very simple: Default values derived from literature review Assumptions (‘extrapolation’) made where no data

21

22  Assume lognormal for all  Soil  Am ±50 Bq/kg  Cs ±5000 Bq/kg  Deer  Am-241 1±0.5 Bq/kg  Cs ±400 Bq/kg


Download ppt "Centre for Ecology & Hydrology - Lancaster 1 st – 3 rd April 2014 David Copplestone & Nick Beresford."

Similar presentations


Ads by Google