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# Uranium in Soil and Building Material Individual Dose Calculator

(last updated 15 Oct 2012)
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Calculate the radiation dose and risk for an individual living on soil contaminated from uranium and/or in a home built from such contaminated material (residential exposure scenario).

Enter data and parameters, and click the "Calculate" button below. HELP

Numbers can be entered in exponential notation: 5 · 10-6 = 5e-6

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Input Data
Contaminant concentration in soil
 µg/g mg/g mg/kg g/kg ppm wt_% -------- no type selected -------- Natural uranium (pure) Natural uranium (with progeny) Enriched uranium (3.5% U-235) Depleted uranium (0.2% U-235)

Activity concentrations
Unit:   pCi/g     Bq/g
Activity concentrations in soil
 U-238 Series U-238 +D U-234 Th-230 Ra-226 +D Pb-210 +D U-235 Series U-235 +D Pa-231 Ac-227 +D

Activity concentrations in soil are determined according to contaminant concentration entry, but can also be entered independently
Activity concentration in building material

U-238 Series
Ra-226 +D
+D = short-lived decay products assumed to be in equilibrium

HELP

Results

Exposure Parameters
General     HELP
ED (exposure duration) yr
EF (exposure frequency) d/yr
ETo (outdoor exposure time fraction) unitless
ETi (indoor exposure time fraction) unitless
Ingestion of Radionuclides in Soil     HELP
IRa (adult soil ingestion rate) mg/d
IRc (child soil ingestion rate) mg/d
EDc (child exposure duration) yr (remainder = adult)
IRs (soil ingestion rate) mg/d   1)
1) calculated from IRa, IRc, EDc, and ED
IR s (soil ingestion rate) mg/d
Inhalation of Radionuclides in Fugitive Dusts Emitted from Soil     HELP
IRi (air inhalation rate) m3/d
Ingestion of Homegrown Produce Grown in Soil     HELP
IRvf (vegetable and fruit ingestion rate) kg/year
IRlv (leafy vegetables ingestion rate) kg/year
CPF (contaminated plant fraction from the site) unitless
Ingestion of groundwater contaminated from radionuclides in soil     HELP
IRw (drinking water intake rate) L/d

Site Parameters
General     HELP
Surface area

ACF (area correction factor for gamma radiation) unitless   2)
V (fraction of vegetative cover) unitless
ds (average source depth) m

2) looked up from Surface Area
Soil         HELP
rhob (dry soil bulk density) kg/L
epsilon (total soil porosity) Lpore/Lsoil
thetaw (water-filled soil porosity) Lwater/Lsoil
f (radon emanation fraction from soil) unitless
De (soil effective radon diffusion coeff.) m2/s   3)

3) calculated from epsilon and thetaw
Building Material         HELP
rhom (material density) kg/L
epsilonm (total material porosity) Lpore/Lmatl
fm (radon emanation fraction from material) unitless
De_m (material effective radon diffusion coeff.) m2/s
Building     HELP
DFi (indoor dust dilution factor) unitless
GSF (indoor gamma shielding factor) unitless
FDF (fraction of radon diffusing through floor) unitless
BRH (building room height) m
WAF (ratio of contaminated room surface area to floor surface area) unitless
dw (wall thickness) m
lambdaV (building air exchange rate) per hour
Fi (indoor radon progeny equilibrium factor)

4) affected by soil type initialization
Climate     HELP
City, State (Climatic Zone)
Q/C (inverse of the mean conc. at the center of square source) g/m2-s per kg/m3   5)
Um (mean annual windspeed) m/s   6)
Ut (equivalent threshold value of windspeed at 7 m) m/s
Fo (outdoor radon progeny equilibrium factor)

5) looked up from City/Climate and Surface Area
6) looked up from City/Climate
Groundwater     HELP
METHOD 1
Partitioning Equation
for Migration to Ground Water

DF (dilution factor) unitless

Kd (soil-water partition coefficient) L/kg:
Thorium: Uranium:
Actinium: Protactinium:
Elements without default value are only considered, if site-specific Kd values are entered
METHOD 2
Mass-Limit Equation
for Migration to Ground Water

This method only works if site-specific values are entered for all of these parameters plus for ds in the General Site Parameters section.

I (Infiltration Rate) m/yr
K (aquifer hydraulic conductivity) m/yr