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Growth rings result from new growth in the vascular cambiuma kahhlugan of cells near the bark that botanists classify as a lateral meristem ; this growth in diameter is known as secondary growth. Visible rings result from the change in growth speed through the seasons of the year; thus, critical for the title method, one ring generally marks the passage of one year in the life of the tree.

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Removal of the bark of the tree in a particular area may cause deformation of the rings as the plant overgrows the scar. The rings are more visible in trees which have grown in temperate zoneswhere the seasons differ more markedly. The inner portion of a growth ring forms early in the growing season, when growth is comparatively rapid hence the wood is less dense and is known as "early wood" or "spring wood", or "late-spring wood" [17] ; the outer portion is the "late wood" sometimes termed "summer wood", often being produced in the summer, though sometimes in the autumn and is denser. Many trees in temperate zones produce one growth-ring each year, with the newest adjacent to the bark.

Hence, for the entire period of a tree's life, a year-by-year record or ring pattern builds up that reflects the age of the tree and the climatic conditions in which the tree grew. Adequate moisture and a long growing season result in a wide ring, while a drought year may result in a very narrow one. Direct reading of tree ring chronologies is a complex science, for several reasons. First, contrary to the single-ring-per-year paradigm, alternating poor and favorable conditions, such as mid-summer droughts, can result in several rings forming in a given year.

In addition, particular tree-species may present "missing radiocwrbon, and this influences the selection of trees for study of long time-spans. For instance, missing rings are rare in oak and rasiocarbon trees. Researchers can compare and match these patterns ring-for-ring with patterns from rsdiocarbon which have grown at the same time in the same geographical zone and therefore under similar climatic conditions. When one can match these tree-ring patterns across successive trees in the same locale, in overlapping fashion, chronologies can be built up—both for entire geographical regions and for sub-regions.

Moreover, wood from ancient structures with known chronologies can be matched to the tree-ring data a technique called cross-datingand the age of the wood can thereby be determined precisely. Dendrochronologists originally carried out cross-dating by visual inspection; more recently, they have harnessed computers to do the task, applying statistical techniques to assess the matching.

This section ahg not cite any sources. Please help improve this section by adding citations to reliable sources. Wikipeia material may be challenged and removed. July Thermoluminescence[ edit ] Thermoluminescence testing also dates items to the last time they were heated. This technique is based on the principle that all objects absorb radiation from the environment. This process frees electrons within minerals that remain caught within the item. Heating an item to degrees Celsius or higher releases the trapped electronsproducing light. This light can be measured to determine the last time the item was heated. Radiation levels do not remain constant over time.

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Fluctuating levels can skew results — for example, if an item went through several high radiation eras, thermoluminescence will return an older date for the mg. Many factors can spoil the sample before testing as well, exposing the sample to heat or direct light may cause some of the electrons nb dissipate, causing the item to date younger. It cannot be used to accurately date a site on its own. However, it can be used to confirm the antiquity of an item. Optically stimulated luminescence OSL [ edit ] Optically stimulated luminescence OSL dating constrains the time at which sediment was last exposed to light.

During sediment transport, exposure to sunlight 'zeros' the luminescence signal. Upon burial, the sediment accumulates a luminescence signal as natural ambient radiation gradually ionises the mineral grains. Careful sampling under dark conditions allows the sediment to be exposed to artificial light in the laboratory which releases the OSL signal.


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