Page 28 - Professorial Lecture - Prof Oyedele
P. 28
other towns such as Henties Bay are much higher and more than double
the value of 0.05 mSv/y.
0.3
0.25
EFFECTIVE DOSE RATES (mSv/y) 0.15
0.2
0.1
0.05
0
CITIES AND TOWNS
Figure 6.5: Effective dose rates in different cities and towns.
Director of ceremony, at this stage, one may ask for the implication of a
high or low value of the dose rate. The higher the dose rate of a town, the
higher the level of radiation to which the inhabitants of the town are
exposed. However, there is a maximum permissible limit or maximum
permissible dose rate of 1.0 mSv/y (UNSCEAR, 2000 and Wrixon, 2008). A
dose rate below this value indicates that the level of radiation is low and
the corresponding radiation hazard in the town is negligible.
