USES OF RADIOACTIVE ISOTOPES
a) Study of reaction mechanism
i)
Mechanism of photosynthesis in plants
A small quantity of Radioactive
C O 2(iso) containing
radioactive oxygen O18 is mixed with ordinary carbondioxide and the process is
carried out. It has been found that oxygen
gas evolved along with sugar formation is non-radioactive.
Therefore O2 produced comes from water and not from
carbondioxide. So the correct mechanism
is as follows.
6C O2(iso) + 6H2O ® C6H12 O6 + 6O2(iso)
ii) Study
of hydrolysis of ester
By labelling oxygen, the
mechanism of ester hydrolysis can be studied by using water labelled with O18. The hydrolysis of an ester by water enriched
with radioactive oxygen is indicated as :
Therefore it is the acid and
not alcohol produced which is radioactive confirming the above mechanism.
Radioactive isotopes which are useful in medicine
Use
i.
Measure water content of the body
ii.
Brain scan
iii.
Radioimmunology
iv.
Diagnosis of damaged heart muscles and hyper
v.
Kidney scan
vi.
Diagnosis of anemia
vii.
Treatment of cancer
viii. Location of blood clots and circularity disorders
Gold - 198 Curing of cancers
NUCLEAR REACTIONS TAKING PLACE IN SUN (STARS)
It has been estimated that the sun is giving out energy
equally in all possible directions at the
rate of 3.7 × 1033 ergs/sec. The energy of
the sun is supposed to arise from the
fusion of hydrogen nuclei into helium nuclei which in going on inside it all the time.
The various fusion reactions taking place in the sun are
as follows:
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