ARMY TM 5-5420-212-23
MARINE CORPS TM 08676A-23/2
If Betalights are damaged or broken indoors, immediately open all windows and doors then
vacate the room and notify your servicing Radiation and Protection Officer. All surplus,
unwanted or broken Betalights must be disposed of in accordance with AR 385-11.
Cleaning solvent is toxic and flammable. Use only in well ventilated area and avoid prolonged
breathing of fumes. Keep solvent away from flames. Do not use in excessive amounts and avoid
In the event of breakage of the light source, tritium gas is released to the atmosphere, but this
will rapidly diffuse away with no health hazard. When broken Betalights are being replaced it is
advisable to wear rubber gloves and to take care to avoid physical damage to the products.
A Betalight consists of a glass capsule coated internally with a phosphor and containing the
radioactive gas tritium, which emits only B3 particles (electrons). No external radiation hazard
exists with sealed Betalights or products containing sealed Betalights.
Inspect Betalight (6); if broken, replace with new.
Inspect securing bracket (3) for damage and burrs. Remove any burrs with flat file or if damaged replace
with new bracket.
Unscrew and remove the two hexagon screws (1) and washers (2) securing bracket (3) to sliding block (4),
then remove bracket (3).
Remove the two screws (5) securing Betalight (6) to bracket (3), then remove Betalight.
Remove thread locking compound from threads of screws (1) and (5) with solvent.
Apply thread locking compound to screws (5).
Secure new Betalight (6) to bracket (3) with screws (5).
Apply thread locking compound to hexagon screws (1).
Secure bracket (3) to sliding block (4) with screws (1) and washers (2).