Visual FoxPro - Voss Associates

Ionizing radiation has been directly associated with cataract
formation. Select the statement which is INCORRECT.
A) the cataractogenic dose response is
considered a threshold effect
B) fast neutrons are more effective at producing
cataracts than other forms of radiation
C) the cataract effect is dependent on age at
time of irradation
D) occupational exposure to x-rays accounts for
approximately 1% of the cataracts observed in
x-ray technicians
E) radiogenic cataracts are distinct in that
they originate on the anterior epithelium of
the lens
The correct answer is: D
The lens is rarely exposed in occupational medical x-ray
applications. Even when it is, it is far less than the annual
limit of 15 rem (.15 Sv) on the average. Since the limit is set
to allow much less of an incidence of cataracts than 1%, this
statement is incorrect. All other distractor data are valid.