Researchers from the Ateneo de Manila University and from National University- Mall of Asia Campus have found a surprising new use for the copious amounts of volcanic ash scattered across the Philippines: it can be used to shield against harmful radiation.
 |
Blocks of geopolymer mortar made from Taal volcanic ash (TVA) freshly removed from their molds after being left to cure for 24 hours. It was found that the natural presence of iron-rich minerals in TVA give it strong radiation attenuation properties. CREDIT: Myris V. Supnad |
Radiation shielding is essential for hospitals, industrial sites, and nuclear facilities. These places use ionizing radiation for beneficial purposes such as in helping doctors treat sick organs and broken bones; looking for structural weaknesses in buildings; or helping sterilize food for longer shelf life. Though useful, exposure to ionizing radiation can be harmful for prolonged periods—hence the need for shielding. However, currently available materials like concrete and lead can be expensive and environmentally hazardous. Construction materials made from volcanic ash offer a potential sustainable and lightweight alternative.
