Radioactive dials must remain sealed. If a glass face is cracked, it must be treated as a hazardous spill.
Beyond radiation, legacy jets carry other environmental "legacies" that are heavily regulated: 2022---The-radioactive-legacy-of-the-old-fighter-jets
Common in older insulation and electrical components, requiring abatement before the aircraft can be scrapped for metal recycling. 4. The Shift to "Clean" Replacements Radioactive dials must remain sealed