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(IN PHOTOS: Emotional Kim Chiu in grand concert, welcomes celebrity guests) KIMXI.Xian Lim gives Kim Chiu a kiss during her concert Saturday, April 9.

The lab must consider the possibility of contamination in each sample it dates and depends upon information supplied by the submitter and collector of the material for its assessment.The submitter should supply information detailing the type of environment from which the sample was obtained and commenting on the presence of rootlet intrusion and contaminants.There is more information about AMS Sample Preparation and pretreatment at the Oxford AMS lab and the Rafter Radiocarbon Lab.It is home to historic buildings, museums, tombs, monuments, national parks and much more.When the C14 method was originally developed, Libby and his research team had to assume that the ratios of the carbon isotopes they were measuring had been altered only by 14C decay (Taylor, 1987:3) and that the sample material accurately represented the event to be dated.Pretreatments are designed to remove the contaminating substances that have affected the sample during its post-depositional history.

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