Radioactive waste and abandoned sealed sources are found at nuclear plants, hospitals, laboratories, industrial sites and mines, in fenced stores, concrete vaults, buried pits and heavy shielded containers, often with faded or missing signs. The rule for finding one is to recognise it from a distance, mark it and leave it, because digging, opening or scavenging a sealed source turns a contained hazard into contamination.
Part of Radiation Safety
A waste site here means any place where radioactive material was stored or discarded, from a reactor’s waste store to a single abandoned medical source.
Where They Are
The parent article, Nuclear Safety, says there are thousands of medical, industrial and research sources besides the reactors. By use, the likely places are:
- Power and research plants, with storage buildings, pools and cask yards; see Spent Fuel Dangers.
- Hospitals, especially cancer treatment and diagnostic imaging departments, where heavy shielded units hold strong sealed sources.
- Laboratories and universities with stores of sources and old waste.
- Industrial sites using sources for gauges and for inspecting welds, and old instruments with luminous dials.
- Mines and ore processing sites, where residues may be radioactive.
This list is general knowledge, recalled, not from the corpus.
What They Look Like
| Clue | Meaning |
|---|---|
| Three-bladed warning symbol on a door, fence, drum or box | See Signage & Markings |
| A small container that is surprisingly heavy for its size | Dense shielding, often lead or steel |
| Fenced, locked or unusually strong concrete vaults and pits | Secure storage |
| Rows of capped pipes or small covers in the ground | Possible monitoring or burial points |
| Metal plaques or stone markers at a burial ground | A formal warning, intended to last |
| Old instruments, dials or gauges that glow or carry warning labels | Possible radioactive paint or source |
Many of these clues also describe ordinary things, and a site with nothing marked can still be a waste site. Signs fade, get stolen and are removed.
What To Do When You Find One
- Stop and do not touch. A heavy small container is not a find.
- Do not open, drill, cut, weigh, carry or take it. A shield’s job is to keep the source inside.
- Back away, keeping distance (see Safe Distances).
- Mark the place with markers people will see and note it on the map; see Exclusion Zones.
- Tell everyone and write it in the register.
- If someone did handle it, treat them as contaminated: see Decontamination.
A Real Case
In 1987 in Goiania, Brazil, people took a heavy metal unit from an abandoned clinic and broke it open for the scrap and the curiosity of the glowing powder inside. The material, caesium-137, was handed around, and several people died and many were contaminated. This account is recalled general knowledge, not from the corpus. The lesson applies to every find: a sealed source is safe when sealed.
Common Mistakes
- Scavenging heavy metal containers.
- Using lead-lined boxes as storage.
- Digging near a marked burial ground.
- Assuming no sign means no hazard.
- Letting children handle old dials, gauges or odd metal pieces.
Safety
A heavy, small, unexplained container may be a strong source
Standing near an unshielded strong source can give a harmful dose in a short time, and nothing will be felt. Do not stay to examine it. Alpha and beta contamination from a broken source cannot be reliably detected by an electroscope; see Improvised Detectors.
What’s Next
- Learn next: Signage & Markings — the symbols that warn
- Combine with: Safe Distances — how far to stay