How to Properly Store and Preserve Irradiated Dimes – What are they and are they collectible

Understanding Irradiated Dimes

Over the years, I’ve seen too many valuable irradiated dimes ruined by improper cleaning or storage. These unique pieces deserve careful preservation so future collectors can appreciate their historical significance. Here’s how to keep your irradiated dimes safe for the next generation.

Historical Significance

Before I go any further, I’d love to see your irradiated dimes and associated items! I’ve posted a few to get started, but I’m especially interested in hearing your personal experiences with this fascinating program.

First of all, for those concerned about safety, let me put your mind at ease. These coins were bombarded with neutrons over 40 years ago. They don’t glow in the dark – and never did. The half-lives of the silver isotopes are relatively short, so the radiation diminishes quickly. When “fresh,” they gave off about the same amount of radiation as the luminous hands of a watch.

Identifying Key Markers

Construction – the shell of the encasement is made of aluminum. Inside, there’s a plastic ring that holds the dime in place. This ring features varying inscriptions as shown below. A clear plastic cover is crimped over the dime and ring, unitizing the assembly. However, I’ve seen numerous encasements missing their plastic covers, which can affect both preservation and collectibility.

Physics of Irradiation

Silver-109 is bombarded with neutrons to create Silver-110, a radioactive isotope. Silver-110 has a half-life of 22 seconds, meaning the total number of radioactive atoms drops by 50% every 22 seconds. When Silver-110 decays, beta radiation is emitted, and the atom transforms into Cadmium-110.

Common Varieties

The original encasements featured different outer rings over the years. Based on my research, the varieties I’ve identified (in what I believe is chronological order) include:

• ORNL CCCC – Oak Ridge – Neutron Irradiated – uncommon
• ORNL UCNC – Oak Ridge – Neutron Irradiated – uncommon
• Oak Ridge National Laboratory – Neutron Irradiated – less common but still available
• American Museum of Atomic Energy – Neutron Irradiated – started with black lettering and switched to blue lettering about 1954. These are the most common.
• Mid-South Fairs – Atomic Energy Exhibit – Neutron Irradiated – uncommon

Preservation Guidelines

Toning and Oxidation

The silver dime inside these encasements can develop toning over time. This is a natural process that often enhances the piece’s character and numismatic value. However, excessive oxidation can occur if the plastic cover is compromised or missing. Always inspect the integrity of the plastic lens – cracks or yellowing indicate the piece may be vulnerable to environmental damage.

PVC Damage

Never store irradiated dimes in PVC-based holders or flips. PVC can release acidic gases that will damage both the aluminum encasement and the coin itself. Use only archival-quality, acid-free materials for long-term storage to preserve both the coin’s condition and its historical integrity.

Proper Holders

The best way to store these pieces is in their original encasements whenever possible. If the plastic cover is missing or damaged, consider having it professionally resealed. For display purposes, use inert materials like Mylar or polyethylene holders that won’t react with the aluminum or silver components.

To Clean or Not to Clean

Never attempt to clean an irradiated dime or its encasement. Cleaning can remove toning that adds character and value, and may introduce scratches or chemical residues that accelerate deterioration. If the piece is particularly dirty, consult a professional conservator who specializes in numismatic materials to maintain its mint condition.

Storage Environment

Store your irradiated dimes in a cool, dry environment away from direct sunlight. Temperature fluctuations and humidity can cause the plastic components to degrade faster and may affect the aluminum casing. A stable environment around 65-70°F with 40-50% relative humidity is ideal for preserving these rare varieties.

Handling Precautions

Always handle these pieces with clean, dry hands or wear cotton gloves. The oils from your skin can accelerate tarnishing of the aluminum and may affect the plastic components over time. When examining your collection, work on a clean, soft surface to prevent accidental drops or scratches that could diminish eye appeal.

Display Considerations

If you choose to display your irradiated dimes, use UV-filtering glass or acrylic to protect them from light damage. Avoid displaying them in areas with high traffic where they might be bumped or exposed to temperature changes from heating/cooling vents. Proper display enhances both preservation and the appreciation of these historical pieces.

Documentation

Keep detailed records of your collection including dates, sources, and any unique characteristics. This information becomes invaluable for insurance purposes and for future collectors who may inherit your collection. Documentation also helps establish provenance, which can significantly impact numismatic value.

Conclusion

Irradiated dimes represent a fascinating intersection of history, science, and numismatics. These pieces document the public’s introduction to atomic energy and the Manhattan Project’s legacy. With proper care and preservation, these unique artifacts can remain in excellent condition for generations to come, serving as tangible reminders of this important chapter in American history. Whether you’re a serious collector or simply fascinated by their story, understanding how to properly preserve these pieces ensures they’ll continue to educate and intrigue future collectors for decades to come.

Related Resources

You might also find these related articles helpful:

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