U SES OF RADIOISOTOPES. R ADIOISOTOPES TO STUDY Carbon – 14 Cobalt – 60 Iodine – 131 Iodine -...
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Transcript of U SES OF RADIOISOTOPES. R ADIOISOTOPES TO STUDY Carbon – 14 Cobalt – 60 Iodine – 131 Iodine -...
USES OF RADIOISOTOPES
RADIOISOTOPES TO STUDY
Carbon – 14
Cobalt – 60
Iodine – 131
Iodine - 125
Determine the numbers of protons, electrons and neutrons in each of the radioisotopes.
RADIOISOTOPES
isotope protons electrons neutrons Carbon -14 6 6 8
Cobalt-60 27 27 33
Iodine – 131 53 53 78
Iodine – 125 53 53 72
IODINE-131
The half life is 8 days, it emits beta particles
IODINE-131
Used in medical imaging and the treatment of thyroid cancer.
IODINE-125 Iodine-125 is synthetic and is made in reactors
from an isotope of Xenon.
It has a half life of 59 days (80 according to the text book)
Uses: radiation therapy to treat prostate cancer and brain tumorsNuclear imaging in medicineimaging and scanning of the thyroid gland
More info: It decays by beta capture to an isotope of Te which then emits gamma radiation.
IODINE-125
Seeds to treat prostate cancer
This false-color image shows a mouse heart injected with an iodine-125 agent. In the tomographic reconstruction, the brighter colors correspond to more emission from that region of the heart wall.
RADIOCARBON DATING
Carbon-14 is taken up by living things and when they die, this intake stops.
Knowing that the half-life of carbon-14 is 5700 years, scientists can use carbon-14 to determine the age of fossils and artifacts.
RADIOCARBON DATING IS RELIABLE UP TO 50,000 YEARS*
* http://www.ehow.com/about_6128589_reliability-radiocarbon-dating.html
COBALT-60
The half life is 5.27 days and emits gamma rays
It is useful for radiotherapy of solid cancerous tumors