Physics Sec Sample Paper I Worksheet - University Of Malta, 2012 Page 10
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119.
William Konrad Roentgen worked with rays emitted in closed tubes which
produced marks on photographic films. He did not know what these rays were
and he called them X-rays.
(a)
(i)
Name one medical use of X-rays.
_____________________________________________________________________
(1)
(ii)
Name one property of X-rays that make them suitable for the medical
use you have described above.
_____________________________________________________________________
(1)
(iii)
Name one other use of X-rays outside the medical field.
_____________________________________________________________________
(1)
(b)
A doctor suspects that one of the kidneys of a patient is not working properly.
The doctor injects the patient with a radioactive impurity of iodine that travels
to the kidneys. A normal kidney gradually removes all the impurity from the
blood in about 20 minutes.
(i)
Which type of radioactive material would you expect to be used, one
emitting alpha or gamma? Explain.
_____________________________________________________________________
_____________________________________________________________________
(2)
(ii)
Would you expect a radioactive source with a long or short half-life to
be used? Explain.
_____________________________________________________________________
_____________________________________________________________________
(2)
(iii)
The sketch below shows the results of the test.
count rate
left kidney
right kidney
time (s)
Which kidney do you think is not working properly? Explain.
_____________________________________________________________________
_____________________________________________________________________
(3)
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