Yes
Alpha particles emitted by radium produce radioluminescence is zinc sulfide.
They disperse.
I am guessing you mean "Gruen", and Gruen - and every other manufacturer - makes watches with phosphorescent luminous dials, yes - radium dial watches have not been made since about 1960, to my knowledge.
In modern times, Cobalt-60 is the substance used to make self-luminous paint. Cobalt-60 has replaced Radium's use for the same applications due to Radium's radiation danger.
No, radium does not glow in the dark. If it did, then the whole world would be glowing in the dark. Rocks, soil, plants, and any living thing contains some radioactive material. The myth can be traced back to the "radium craze" of the early 20th century, when radium was just about added to everything. When the radium was added to paint, it became luminous. This was the origin of the "radium glow". In fact, it wasn't the radium glowing, but it was reacting with the copper and zinc in the paint, causing it to become luminous, in a phenomenon called "radio-luminescence".
Stars,radium,torchlight,tv screen,sun,match,light bulb
Today radium has only limited applications in research laboratories, for example for the preparation of radon standard solutions, in neutron sources of the type Ra-Be, etc. Possible use in radiotherapy of some cancers. Radium was used in the past for luminescent painting of watches and other instruments, was used rarely in toothpaste, cosmetics, etc. These applications are not permitted now because radium is strongly radioactive and dangerous.
Luminous objects are the objects that responsible for our vision and omit their own light. Stars, radium, LED, and sparks are some of example of artificial luminous object.
Radium is the radioactive element commonly used in luminous paints to produce a glow-in-the-dark effect. The decay of radium releases energy in the form of light, making the paint glow without needing an external light source. Due to its radioactivity, caution should be taken when handling materials containing radium.
Old luminous watches and clocks, certain types of antique glassware, and some old paint products may contain radium. These items were commonly used before the harmful effects of radium were fully understood.
Radium. I think.
Radium (Latin radius, ray) was discovered by Marie Skłodowska-Curie and her husband Pierre on December 21, 1898 in pitchblende. Radium was formerly used in self-luminous paints for watches, nuclear panels, aircraft switches, clocks, and instrument dials.