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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Related Experiment Video

Updated: Jul 19, 2026

Production of Synthetic Nuclear Melt Glass

Production of Synthetic Nuclear Melt Glass

Published on: January 4, 2016

Special Issue: Materials for Nuclear Waste Immobilization.

Neil C Hyatt¹, Michael I Ojovan^2,3,4

¹Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK. n.c.hyatt@sheffield.ac.uk.

Materials (Basel, Switzerland)

|November 6, 2019

Summary

Safe management of nuclear waste is vital for sustainable nuclear energy. This involves immobilizing radioactive waste in durable materials like advanced ceramics and glasses for long-term environmental protection.

Keywords:

ceramics conditioning durability glass glass composite materials immobilisation nuclear waste spent nuclear fuel vitrification wasteforms

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Last Updated: Jul 19, 2026

Production of Synthetic Nuclear Melt Glass

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Published on: January 4, 2016

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident

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Area of Science:

Nuclear energy
Environmental science
Materials science

Background:

Nuclear energy offers a clean alternative to fossil fuels, but generates nuclear waste.
Effective nuclear waste management is essential for sustainable energy production and environmental safety.
Nuclear waste requires processing, immobilization, and packaging for safe storage and disposal.

Discussion:

Immobilization of radionuclides in durable wasteforms is the primary barrier in nuclear waste management.
Materials science plays a crucial role in developing effective multibarrier systems for isolating radioactive waste.
This Special Issue examines current and novel materials for nuclear waste immobilization, focusing on conditioning technologies.

Key Insights:

Advanced cementitious materials, geopolymers, glasses, glass composites, and ceramics are key materials for nuclear waste immobilization.
The performance and durability of these wasteform materials are critical for ensuring the long-term safety of storage and disposal systems.
Recent advances include studies on glasses, ceramics, cements, and spent nuclear fuel, emphasizing durability and disposal behavior.

Outlook:

Continued research into advanced materials is necessary for improving nuclear waste management.
Understanding the long-term performance of wasteforms in disposal environments is crucial.
Developing efficient and safe conditioning technologies will enhance the overall safety of nuclear waste disposal.