Carbon dating half life period
The three most important dating techniques which are useful for the analysis of works of art are: Thermoluminescence (TL), Dendrochronology (DC), and Carbon 14 (C15). It dates items between the years 300-10,000 BP (before present).Thermoluminescence dating is generally not very accurate.The light is proportional to the amount of radiation absorbed since the material was last heated.Natural radioactivity causes latent thermoluminescence to build up so the older an object is, the more light is produced. Symbol C An abundant nonmetallic element that occurs in many inorganic and in all organic compounds, exists freely in amorphous, graphite, and diamond forms and as a constituent of coal, limestone, and petroleum, and is capable of chemical self-bonding to form an enormous number of chemically, biologically, and commercially important molecules.Other significant allotropes include fullerenes and nanotubes.Symbol: C; atomic no: 6; atomic wt: 12.011; valency: 2, 3, or 4; relative density: 1.8–2.1 (amorphous), 1.9–2.3 (graphite), 3.15–3.53 (diamond); sublimes at 3367±25°C; boiling pt: 4827°C 1. Symbol C A naturally abundant, nonmetallic element that occurs in all organic compounds and can be found in all living things. Proteins, sugars, fats, and even DNA all contain many carbon atoms.
Measuring the intensity of the luminescence can determine how much time has passed since the last time the object was heated.
In 1985 an entirely new form of carbon was discovered in which carbon atoms join to make a sphere called a buckminsterfullerene or buckyball, after Buckminster Fuller, who created buildings with a similar appearance.
Unfortunately there are no affordable direct methods for dating pigments, except in some cases as we will see later.
However, producing fakes with this method calls for expertise on the subject, as well as expensive instruments.
Instead, a less sophisticated method that would deceive TL testing is to reuse original broken and unmarketable pieces.Forgers commonly use the bottom of an original broken vessel, which has no commercial value, and make a new fake vessel on top of it.