[kidcoltoutlaw]

I have an old set on my P226 357 SIG they are marked PT but they also have H3 marked on them . Anybody know what that means ? I like them and hope I can get another set just like them,

Thanks,Keith

[rwschill]

PT Night Sights can be contacted at 800-334-3573 or www.mmcsight.com or www.ptnightsights.com.

[Fred Fuller]

H3 = Tritium

lpl/nc
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http://www.epa.gov/radiation/radionuclides/tritium.htm

Tritium
The Basics
What is tritium?
Tritium (chemical symbol H-3) is a radioactive isotope of the element hydrogen (chemical symbol H).

Who discovered tritium?
Tritium was discovered by physicists Ernest Rutherford, M.L. Oliphant, and Paul Harteck, in 1934, when they bombarded deuterium (a hydrogen isotope with mass number 2) with high-energy deuterons (nuclei of deuterium atoms).

Where does tritium come from?
Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a byproduct in reactors producing electricity, and in special production reactors, where the isotope lithium-6 is bombarded to produce tritium.

What are the properties of tritium?
Tritium is a hydrogen atom that has 2 neutrons in the nucleus, in addition to its single proton, giving it an atomic weight near 3. Although tritium can be a gas, its most common form is in water, because, like non-radioactive hydrogen, radioactive tritium reacts with oxygen to form water. Tritium replaces one of the stable hydrogens in the water molecule, H2O, and is called tritiated water. Like H2O, tritiated water is colorless and odorless. Tritium has a half-life of 12.3 years and emits a very weak beta particle.

What is tritium used for?
Tritium has several important uses. Its most significant use is as a component in the triggering mechanism in thermonuclear (fusion) weapons. Very large quantities of tritium are required for the maintenance of our nation's nuclear weapons capabilities.

Tritium is also produced commercially in reactors. It is used in various self-luminescent devices, such as exit signs in buildings, aircraft dials, gauges, luminous paints, and wristwatches. Tritium is also used in life science research, and in studies investigating the safety of potential new drugs.

[kidcoltoutlaw]

For the info.