Presentation: Forest Scenario

Transcription

1 5 th Meeting of the EMRAS II Working Group 8 Environmental Sensitivity September 211 SCK CEN Headquarters Av. Herrmann Debroux 4, 116 Brussels, Belgium Presentation: Forest Scenario Gene (Jige) Shen EcoMetrix Inc. ON, Canada

2 Scenario Location

3 Scenario Setup

4 Considered Pathways 1

5 Considered Pathways 2

6 Scenario Assumptions Progenies: ; Background radiation levels are neglected; Source loading assumptions: soil in mass basis (Bq/kg) and water in volume basis (Bq/L) Animal diet assumptions: all animals of interest are wild animals (no human feeds) and live in the site all year around (no migration) and only consume local foods. Human diet assumption: local residents live in the site 1% of time, plant and fish foods are from local produce, and 1/3 of adult intake meat and ¼ infant meat intake are from local meat sources.

7 Seasonal Variation The seasonal variation consideration: the baseline water flow on a monthly basis. Baseline Water Inflow 65 6 Flow rate (L/s) Animal dietary data are on annual average basis from CSA N Annual averaged human dietary data are used: Look at human doses at the end of certain years; approaches to after 2 months. and have effective half life of about 2 months. The human doses are hardly show difference due to the diet changes over seasons; The human diet assumptions are already much conservative. To apply the seasonal diet variation doesn t increase accuracy.

8 Human Dose (msv/a) Total Dose after the fallout Total Dose after the fallout (log scale) 2.5 Adult 1 Adult 2 Infant_1y Infant_1y Dose (msv/a) Dose (msv/a) Adult Dose at year Adult Dose at 1 year Pathways Terrestrial animals Terrestrial plants Aquatic animals Aquatic plants Sediment (external) Sediment (ingestion) Soil (external) Soil (ingestion) Water (external) Water (ingestion) Air (external) Air (inhalation) Pathways Terrestrial animals Terrestrial plants Aquatic animals Aquatic plants Sediment (external) Sediment (ingestion) Soil (external) Soil (ingestion) Water (external) Water (ingestion) Air (external) Air (inhalation) Dose (msv/a) Dose (msv/a)

9 Animal Concentrations 6 Mallard Concentrations 25 Beaver Concentrations E+5 1.E+4 1.E+3 1.E+2 1.E+1 Animal Concentrations Beaver Mallard Caribou Moose Grouse The whole body concentrations for Hare, Loon, Muskrat, Vole, Scaup, Lynx, Mink, Wolf are available; Animal rad doses and risk quotients can be calculated in the scenario. 1.E+ 1.E 1

10 Plant Concentrations Blueberry Concentrations Labrador Tea Concentrations.2.2 The plants have two sources: soil and air. The soil source is the dominating source.

11 Fish Concentration Fish Concentrations The fish concentration in fresh weight basis is in equilibrium condition with the water concentration assuming the water/fish reaches equilibrium instantly.

12 Soil Concentration Soil Concentrations Assume the initial 1Bq/m 2 ground activity uniformly distributed over the top 1cm layer. The dry bulk density is 1.6kg/L The water content is.15 That is: The soil initial concentration is 7.35Bq/kg (dry weight basis). This value applies to,, Sr 9 and.

13 Water/Sediment Concentrations Concentration (Bq/L) Water Concentrations Sediment Concentrations Assume the pond water 1Bq/m 2 is applied to all water depth; The water depth is 1.5m; Assume the sediment has no initial activity at time from the fallout event. That is: The initial water concentration is.667bq/l. This applies to,, and ; The sediment initial concentration is.

14 Air Concentration Concentration (Bq/m 3 ) 1.4E 7 1.2E 7 1.E 7 8.E 8 6.E 8 4.E 8 2.E 8 Outdoor air Concentrations.E+ The air concentration is in equilibrium condition with the soil concentration by a soil re suspension process.