Libby analyzed that the decay of radiocarbon at a constant rate should be balanced by its constant production through cosmic radiation and therefore the proportion of 14C in the atmosphere should remain the same throughout time. However, Libby’s about the level of 14C in the atmosphere has varied some what, since the radio carbon dates obtained from tree- rings show that before about 1000BC, trees were exposed to greater concentrations of atmospheric 14C than they are today. At this point it should be noted that this radio carbon method can be used anywhere, no matter the climate, as long as there is material or organic origin. This is different as compared to the other absolute dating technique discussed above potassium argon which is only limited to dating volcanic rocks. During the latter half of the twentieth century, certain advancements had been made to help correct the limitations of radiocarbon dating. For instance the accelerator mass spectrometry (AMS) method is becoming the dominant method used in radiocarbon dating. This requires smaller samples still. AMS counts the atoms of 14C directly, disregarding their radioactivity. The minimum sample size is reduced to as such little as 5-10mg, thus enabling precious organic materials such as the Turin shroud , to be sampled and directly dated, and making feasible the direct dating of pollen. Primarily, it was hoped that the dateable time span for radiocarbon using AMS could be pushed back from 50,000 to 80,000 years, although this is proving difficult to achieve in part because of sample contamination. (Thomas 1999, 76). It should be noted that for inorganic materials, thermoluminesence and other new dating techniques are useful. As compared to the other dating techniques as discussed above, radiocarbon dating can be seen as the most accurate and important to archaeologist in putting together the past. It was used to date Upper Paleolithic paintings in the Chauvet Cave, southern France. However all results over 30,000 BP are subjected to problems. Radiocarbon was also used to assert to validity of the chronology of Europe. In the Caribbean, overseas radio carbon dating techniques are also used, in particular Trinidad. The nation’s parliamentary building currently is undergoing excavations, and the materials they find are shipped overseas for accurate dating using radiocarbon because Trinidad does not have the proper equipment for dating it, since radiocarbon equipment maybe some what expensive for a development nation to endure. In conclusion it can be said that radio carbon dating, potassium argon, seriation and stratigraphy are important dating techniques one way or the other. Although radiocarbon can be seen as the most efficient because of it accuracy and how far back it can date, the othe>