Answer :
If a sustained exposure dose of 280msv/hr was measured 100m from a source , then the exposure rate at 35km from the source is 8 msv/hr .
The Exposure Rate is defined as the amount of ionizing radiation per hour in a person's vicinity , whereas the dose rate is biological effect on body from exposure to that radiation .
it is given that , exposure rate = 280msv/hr when
distance from source is = 100 m ,
we need to find the exposure rate when the distance is 35 Km from the source ;
we know the formula , that
F = Γ × α/r , where F = exposure rate , Γ = exposure rate constant ;
r = distance .
substituting the values ,
we get ;
280 = Γ × α/100 ....equation(1) ;
F = Γ × α/35000 .....equation(2) ;
dividing equation(10 by equation(2) , we get ;
280/F = 35
simplifying further , we get ;
F = 280/35 = 8 msv/hr .
Therefore , the exposure rate is 8 msv/hr when the source is 35 km from the source .
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