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The clay core of bronze sculptures made by lost wax casting can also be tested.Different materials vary considerably in their suitability for the technique, depending on several factors.At Earth's surface most of these nuclides are produced by neutron spallation.Thermoluminescence (TL) dating is the determination, by means of measuring the accumulated radiation dose, of the time elapsed since material containing crystalline minerals was either heated (lava, ceramics) or exposed to sunlight (sediments).When one of these particles strikes an atom it can dislodge one or more protons and/or neutrons from that atom, producing a different element or a different isotope of the original element.

The most recent of these is the single-aliquot regenerative-dose (SAR) protocol, first suggested by Murray and Roberts (Radiation Measurements 29, 503–515, 1998).

Subsequent irradiation, for example if an x-ray is taken, can affect accuracy, as will the "annual dose" of radiation a buried object has received from the surrounding soil.

Ideally this is assessed by measurements made at the precise findspot over a long period.

The trapped charge accumulates over time at a rate determined by the amount of background radiation at the location where the sample was buried.

Stimulating these mineral grains using either light (blue or green for OSL; infrared for IRSL) or heat (for TL) causes a luminescence signal to be emitted as the stored unstable electron energy is released, the intensity of which varies depending on the amount of radiation absorbed during burial and specific properties of the mineral.

It is useful to geologists and archaeologists who want to know when such an event occurred.

It uses various methods to stimulate and measure luminescence It includes techniques such as optically stimulated luminescence (OSL), infrared stimulated luminescence (IRSL), and thermoluminescence (TL).

"Optical dating" typically refers to OSL and IRSL, but not TL.

All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium, uranium, thorium, and rubidium.

The most common of these dating techniques is Cosmogenic radionuclide dating.

Earth is constantly bombarded with primary cosmic rays, high energy charged particles — mostly protons and alpha particles.