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Radium was used to make self-luminous paint from the early 20th century to about 1970. Promethium briefly replaced radium as a radiation source. Tritium is the only radiation source used in radioluminescent light sources today due to its low radiological toxicity and commercial availability.
Radioluminescent paint is a self-luminous paint that consists of a small amount of a radioactive isotope (radionuclide) mixed with a radioluminescent phosphor chemical. The radioisotope continually decays, emitting radiation particles which strike molecules of the phosphor, exciting them to emit visible light.
It is used on wristwatch faces, gun sights, and emergency exit signs. The tritium gas is contained in a small glass tube, coated with a phosphor on the inside. Beta particles emitted by the tritium strike the phosphor coating and cause it to fluoresce , emitting light, usually yellow-green.
F27 Sights, rocking-bar (all types) – Parts and equipment; F28 Sight, M1901 (French) F29 Sight, M1916, for 75 mm Gun M1916 – Parts and equipment; F30 Sight, telescopic, 2.24-inch (6 Pdr.) tank gun, Mk.II (British) -Parts and equipment; F31 Sight, M1916, telescopic, 37mm gun, M1916 – Parts and equipment, 18 October 1926
The invention of black light paint is attributed to brothers Joseph and Robert Switzer in the 1930s. After a fall, Robert suffered a severe head injury that resulted in a severed optic nerve. His doctor confined him to a dark room while he waited for his sight to recover.
Most ACOG models, when mounted to a carry handle, have an open space through the mount to allow the use of the rifle's iron sights without removing the scope. [citation needed] Others include Docter or Trijicon [10] reflex sights mounted on top, such as the TA11SDO (SU-258/PVQ) and the TA648MGO (SU-260P). [11]
Both the M70B1 and M70AB2 were fitted with night sights, which alternatively utilized tritium vials or were marked with luminescent paint, that could be raised or lowered as needed. [8] Small numbers of M70B1s and M70AB2s were manufactured with mounting brackets for optics, these were designated M70B1N and M70AB2N, respectively. [8]
A tactical light mounted to the bottom rail of a rifle Tactical light and a target in a low-light environment. A tactical light or weapon light is a flashlight used in conjunction with a firearm to aid low-light target identification, allowing the user to simultaneously aim a weapon and illuminate the target.
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