PLUTONIUM CONTENTS OF FIELD CROPS 395 



1 X 10^-- 

 5 -- 



2 -- 



10-- 

 5 -- 



2 -- 



5 -- 



2-- 



1 X 10"^ 



5-- 



2-- 

 1 X 10"2 — 



--1 X 10^ 

 -- 5 



-- 2 



--10 

 --5 



-- 2 



-- 5 



-- 2 



--1 X 10"'' 

 -- 5 



-- 2 



— 1 X 10"2 

 -- 5 



-- 2 



— 1 X 10"^ 

 -- 5 



-- 2 



— 1 X 10"'' 

 -- 5 



--2 



--1 X 10'^ 



70-yr 

 DOSE, 



BONE 

 mrem 



-ri X lo'^ 



-- 5 



-- 2 



'1 X 10^ 



-- 5 



--2 



--1 X 10^ 



--5 



--2 



-^1 X 10^ 



FOODSTUFF 

 CONSUMED, g 



PLUTONIUM 



CONCENTRATION, 



fCi/g 



Fig. 2 Nomograph for calculating dose to bone from consumption of plutonium- 

 contaminated foodstuff. The dose is that which will be received by the bone during a 

 70-yr life-span. The following assumptions from ICRP publications were used: effective 

 absorbed energy per disintegration, 270 MeV (International Commission on Radiological 

 Protection, 1959); fraction from gastrointestinal tract to blood, 3 x 10~^ ; fraction from 

 blood to bone, 0.45; half-Ufe in bone, 100 yr (International Commission on Radiological 

 Protection, 1972); mass of bone, 5 x 10^ g (International Commission on Radiological 

 Protection, 1972). 



Soils at SRP 



As with plant materials, the resuspendible matter and soils from the South Field (closer 

 to the stack) had higlier plutonium concentrations than those from the North Field 

 (Table 6). The differences in concentrations were more pronounced in the resuspendible 

 matter where the South Field had plutonium levels one order of magnitude higher than 

 the North Field. Soils (0 to 5 cm) from both fields had plutonium levels about three 

 orders of magnitude higlier than soils from the control site. Cultivation of the fields 

 resulted in more uniform plutonium concentrations in the soil profile, increasing the 

 plutonium at the deeper depths (5 to 15 cm). Cultivation also altered the isotopic 



