Appendix CRF - Part 3 - Northamptonshire County Council

Radiological Assessment 0820-2
Version 2
A.4 Doses arising from use of contaminated groundwater
If a well or river is used for irrigation, then doses can result from ingestion of
foodstuffs raised on contaminated soil, inhalation of dust from the soil, and external
exposure to the soil. Drinking of contaminated water from a well or river is also a
potential exposure pathway. If contaminated groundwater discharges to surface water
(spring, river, sea), then ingestion of foodstuffs from the surface water is a potential
exposure pathway.
Dose from ingesting contaminated soil that may be attached to crops is given by:
Dose Q C
( t)
D
ing,
soil
soil
Rn,
soil
where Qsoil is the soil consumption rate (kg year –1 ).
CRn,soil(t) is the concentration of radionuclide in the soil at time t (Bq kg -1 ).
Ding is the dose coefficient for ingestion of radionuclide, Rn (Sv Bq -1 ).
Dose from crops grown on contaminated soil is given by:
Irrig rate Intcrop
Fcrop
Dose
ing,
crops Qcrop
CRn,
water ( t)
C
Rn,
soil ( t)
TF
crop Yieldcrop
Galson Sciences Limited 74 14 July 2009
Rn
ing
Rn
crop
D
where Qcrop is the crop consumption rate (kg year –1 ).
Irrigrate is the rate of irrigation (m year -1 ).
Intcrop is the effective interception factor (dimensionless).
Fcrop is the fraction remaining after processing (dimensionless).
Yieldcrop is the crop yield (kg m -2 ).
TFcrop is the soil to crop transfer factor for radionuclide, Rn (Bq kg -1 fresh
weight of crop per Bq kg -1 of soil).
CRn,water(t) is the concentration of radionuclide in the water used for irrigation at
time t (Bq m -3 ).
CRn,soil(t) is the concentration of radionuclide in the crop soil at time t
(Bq kg -1 ).
Ding is the dose coefficient for ingestion of radionuclide, Rn (Sv Bq -1 ).
Dose from livestock and associated products (e.g., milk) raised on contaminated
ground and fed with contaminated crops is given by:
Doseing, animal animal soil Rn soil
crop Rn soil crop animal
animal
, ( ,
crop
Rn Rn Rn
Q
q C
t)
qC( t)
TF
TF D
where Qanimal is the animal foodstuff consumption rate (kg year –1 ).
qwater is the water consumption rate by the animal (m 3 day –1 ).
qsoil is the soil consumption rate by the animal (kg day –1 ).
qcrop is the crop consumption rate by the animal (kg day –1 ).
TFcrop is the soil to crop transfer factor for radionuclide Rn (Bq kg -1 fresh
weight of crop per Bq kg -1 of soil).
TFanimal is the animal product transfer factor for radionuclide Rn (days kg -1 ).
WS010001/ENRMF/CONSAPPCRF 624
ing
Rn
ing