Discover the world with our lifehacks

What isotope will be produced when O 15 undergoes positron emission?

What isotope will be produced when O 15 undergoes positron emission?

Oxygen-15 decays with a half-life of about 2.04 minutes to nitrogen-15, emitting a positron. The positron quickly annihilates with an electron, producing two gamma rays of about 511 keV which are detectable using a PET scanner.

What type of decay is oxygen-15?

beta-plus decay
[2 points] (b) Oxygen-15 decays via beta-plus decay, which means it gives off a positron and an electron neutrino. Because of this, oxygen-15 is often used in positron emission tomography studies.

What mode of radioactive decay is most likely for the O 15 isotope?

1 Answer. Ernest Z. Stefan V. Oxygen-15 undergoes positron decay because it has too few neutrons for the number of protons.

How is oxygen-15 used in PET scan?

The radionuclide oxygen-15, half-life 2.05 min, is used in simple chemical forms to study oxygen metabolism, blood flow and blood volume in man, using the technique of positron emission tomography (PET).

How is oxygen-15 produced?

Oxygen-15 is commonly produced by deuteron bombardment of a nitrogen gas target via the 14N(d,n)15O reaction.

How many total neutrons are there in an 14o isotope?

1 Answer. Stefan V. 7 electrons, 7 protons, and 7 neutrons.

What is the charge of the emitted positron?

Positron Emission A positron is a particle with the same mass as an electron, but with a positive charge. Like the beta particle, a positron is immediately ejected from the nucleus upon its formation. The symbol for a positron in an equation is e+01. For example, potassium-38 emits a positron, becoming argon-38.

What do PET scans show?

The PET scan uses a radioactive drug (tracer) to show both normal and abnormal metabolic activity. A PET scan can often detect the abnormal metabolism of the tracer in diseases before the disease shows up on other imaging tests, such as computerized tomography (CT) and magnetic resonance imaging (MRI).

What is positron emission with example?

Positron Emission Positrons are the antiparticles of electrons, therefore a positron has the same mass as an electron but with the opposite (positive) charge. In positron emission, the atomic number Z decreases by 1 while the mass number A remains the same. Some examples of positron emission are. B85→Be84+e+01+νe.

What is the mass number of the emitted positron?

The positron is the antiparticle of the electron. It has the same mass (9.109×10−31 kg), electric charge (1.602×10−19 C), and spin (1/2) as the electron, but the sign of the charge for the positron is positive, opposite to that of the electron.

How many protons and neutrons in oxygen 15?

Oxygen-15 has 7 neutrons and 8 protons. It is unstable because it is below the band of stability. Its n:p ratio is 7:8 or 0.88:1. It has too few neutrons for the number of protons, but it would become more stable if it could gain a neutron or lose a proton.

Why does oxygen 15 undergo positron decay?

Oxygen-15 undergoes positron decay because it has too few neutrons for the number of protons. The principal factor that determines whether a nucleus is stable is the neutron to proton (n:p) ratio. The diagram below plots the number of neutrons versus the number of protons in the first 15 elements.

What isotopes emit positrons?

Positron-emitting isotopes Isotopes which undergo this decay and thereby emit positrons include carbon-11, nitrogen-13, oxygen-15, fluorine-18, copper-64, gallium-68, bromine-78, rubidium-82, yttrium-86, zirconium-89, yttrium-90, sodium-22, aluminium-26, potassium-40, strontium-83, and iodine-124.

What is the number of electrons in a neutral atom of oxygen?

The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. Therefore, the number of electrons in neutral atom of Oxygen is 8. Each electron is influenced by the electric fields produced by the positive nuclear charge and the other (Z – 1) negative electrons in the atom.