radioactivity of oxygen

1. The nuclear and
radiochemistry of
Oxygen
Muhammad taaha khan, ic-18008
Queries will be taken after presentation or email at
muhammadtaahakhan19697@gmail.com

2. Elementary Introduction:
➢ Name : oxygen, meaning Acid producer
➢ Existence : exist as diatomic gas
➢ Molecular mass: 32 gmol
➢ An atomic oxygen has 16 g per mol mass
comprising of 8p, 8e, 8n.

3. Elementary Introduction
➢ Electron configuration [He] 2s2 2p4
➢ Mp : - 219 C
➢ B.P : --183 C
➢ Density (at STP) 1.429 g/L
➢ when liquid (at b.p.) 1.141 g/cm3
➢ Oxidation states
−2, −1, 0, +1, +2
➢ Magnetic ordering paramagnetic

4. This is how it looks like if oxygen is
liquified!

5. Elementary Introduction
➢ stable isotopes of oxygen (8O): 16O, 17O, and
18O.
➢ O16, O17, O18 are stable with 99.76%, 0.04%,
and 0.20% natural abundance
➢ Radioactive isotopes ranging from 11O to 26O
have also been characterized, all short-lived.
The longest-lived radioisotope is 15O with a half-
life of 122.24 seconds.

6. Importance
➢ NUCLEOSYNTHESIS IN
STELLAR EVOLUTION
O16 + O16 >>>> Si + 4He2
➢ OZONE
Absorbs at 200-280 nm
O2 >>> 2O
O + O2 >>> O3

7. Importance
➢ Radioactive exposure
➢ Natural growth rate
(global photochemical
synthesis of living and
non living organisms)

8. ➢ Oxygen transport

9. ➢ Oxygen flame
➢ Stellar dust (Fe,Ni)
➢ Dole effect

10. ➢ Radiotherapy

11. Oxygen is usually not really radioactive
then what if there was a radioisotope of
oxygen?What do you think will
happen?let us talk about research on the
different isotopes of oxygen including the
radioactive O15 molecule

12. O-15 Importance :
➢ Oxygen-15 and nitrogen-13 are produced in the atmosphere when gamma
rays (for example from lightning) knock neutrons out of oxygen-16 and
nitrogen-14:[22]
16O + γ → 15O + n
14N + γ → 13N + n
➢ It has 8 protons, 7 neutrons, and 8 electrons. The total atomic mass is
15.0030654 amu
➢ It has a half-life of 122.24 seconds.[20] Oxygen-15 is synthesized through
deuteron bombardment of nitrogen-14 using a cyclotron.
➢ positron emission tomography (PET) imaging

13. O-15 Importance :
➢ Oxygen-15 labelled water (also known as 15O-water, [O-15]-H2O, or H2
15O) is a
radioactive variation of regular water, in which the oxygen atom has been
replaced by oxygen-15 (15O), a positron-emitting isotope. 15O-water is used as a
radioactive tracer for measuring and quantifying blood flow using positron
emission tomography (PET) in the heart, brain and tumors.
➢ Due to its free diffusibility, 15O-water is considered the non-invasive gold
standard for quantitative myocardial blood flow (MBF) studies
➢ Oxygen-15 can be produced by different nuclear reactions, including
14N(d,n)15O, 16O(p,pn)15O and 15N(p,n)15O.
➢ They all produce the radioactive isotope oxygen-15 by knocking neutrons out
of the target molecule where the oxygen-15 ion combines with an oxygen atom
to form the stable oxygen gas [15O]O2:
➢ Oxygen-15 decays with a half-life of about 2.04 minutes to nitrogen-15, emitting
a positron.[6] The positron quickly annihilates with an electron, producing two
gamma rays of about 511 keV which are detectable using a PET scanner.

15. Alhamdulillah!
I am not
radioactive
after all !