Isotopes

Nitrogen has two natural isotopes: N-14 with 7 neutrons and N-15 with 8 neutrons.

Isotopes are atoms of the same element but with a different number of neutrons.

Example for the isotope 228 of uranium:
- uranium-228
- U-228

-- 22892U

sealed radioactive source means the radioactive isotopes which is encapsulated with a stainless steel to avoid higher LET radiation condamination .typically source may be used in brachytherapy to treat the cancer and unsealed source used to in nuclear medicine which is the radioactive source is not sealed examble IODINE131

This process is called alpha decay.

Atoms of the same element that differ in number of neutrons

It is simply that among period 2 elements, oxygen (8) is one of the elements which has the largest number of isotopes, among period 4 elements, calcium (20) has the largest number of isotopes, and among period 5 elements, tin (50) has the largest number of isotopes. In fact tin has the largest number of isotopes overall.

It's usually americium-241. It undergoes alpha-decay with a half-life of about 400 years. Am-241 is artificially manufactured; it doesn't occur in nature.

A higher percentage of daughter isotopes present in a sample, the older the rock is.

After 6 hours 50 % of Tc-99m is disintegrated.

The chemical notation is 19F.

H-1. It accounts for 99.9885%

This value is identical for isotopes.

Isotopes that emit particles and give off energy are known as "radioactive" isotopes.

The particles they emit generally come in the form of α-radiation i.e α particles (helium nucleus), and ß-radiation, i.e. ß-particles (electron or positron). Some small amount of neutrons may be emitted by an isotope as a byproduct of α-radiation.

The primary energy emitted by radioactive isotopes is gamma radiation and heat; the heat comes from the effect of α-, ß and gamma radiation being absorbed by the surrounding materials.

deuterium

Npn decays to Pan-4 and alpha.

Only isotopes 234, 235, and 237 of neptunium can undergo alpha decay, the others decay by beta-, beta+, K capture, and/or gamma decay. So the only products of neptunium alpha decay can be protactinium isotopes 230, 231, or 233.

Isotopes of a chemical element have a similar number of protons but a different number of neutrons.

The differences in chemical properties are not significant (excepting protium and deuterium); the physical properties are different.

It's called "half life".

Isotopes of an element have same number of protons and different number of neutrons. Hence similar in chemical properties and different in physical properties.

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In this case alpha particles are emitted.

Uranium has 3 natural isotopes and 26 artificial isotopes and isomers..

No, it is not correct; only a nuclear chain reaction can be stopped with control rods.

Calcium (Ca) contains:

20 protons (positively charged)

20 neutrons (neutral)

Outside of the nucleus:

20 electrons (negative charge) with the configuration 2-8-8-2

Calcium has an atomic mass of 40.08

Cosmogenic isotopes are isotopes that are produced in rocks or minerals by the interaction of cosmic radiation with the Earth's surface. They are useful for dating geological events, such as erosion and exposure ages of rocks, and for studying processes such as rock weathering and sediment transport. Examples include beryllium-10 and aluminum-26.