Homework What is the oldest time limit for using radiocarbon dating?
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1 Homework What is the oldest time limit for using radiocarbon dating? 2. A charcoal from a Neanderthal site was found to contain a ration of C14 to C12 was only 9% of that in the fresh wood. How old is this piece of charcoal? 3. List at least two additional dating methods used in archaeology. 4. Rdi Radiocarbon dti dating does not yield ildconclusive result with the date dt of the shroud of Turin. What are the other methods one can use? 5. If you run a radiocarbon dating laboratory, which artifact you like to analyze? Why? Anna Lee
2 1. What is the oldest time limit for using radiocarbon dating? Radiocarbon dating can t be used for material that is older than 50,000 years because it would have too little carbon 14 to measure. Anna Lee
3 2. A charcoal from a Neanderthal site was found to contain a ratio of C14 to C12 was only 9% of that in the fresh wood. How old is this piece of charcoal? N t N 0.09 ln N t N 0 t t N t ln N0 ln y y The charcoal is about 19,900 years old. Anna Lee
4 3. List at least two additional dating methods used in archaeology. One dating dti method is dendrochronology, d also called tree ring dating. dti Dendrochronology depends on the fact that growth rings of trees have show variation depending on the rainfall or climate. Trees make a new ring every year. Cold, dry year causes thin rings and warm, wet year causes thick rings. If archaeologists found a old, preserved piece of timber at a site, they can identify the species of the wood, and cross date it with living trees of the same species in the area by comparing the pattern of the rings. The oldest age measured using dendrochronology is about 9000 years. Anothermethod is potassium argon argondating. Molten rock releases argon 14 into the atmosphere. When the rock cools, no more argon 14 can escape. Potassium 40 is a radioactive isotope that decays into argon 14 and by measuring the ratio of potassium 40. It can be used to measure ages as old as 4.5 billion and as young as 20,000. If an artifact is found between layers of volcanic rock, then archaeologist can determine the age of the volcanic rock to get an idea of how old the artifact is. ating.html tml dh/dendrochronology/dendrochronology.html argon dating Anna Lee
5 4. Radiocarbon dating does not yield conclusive result with the date of the shroud of Turin. What are the other methods one can use? The way that radiocarbon dating was done on the shroud was questionable. Radiocarbon dating found that the shroud originated from the medieval ages. However, another method was to test the amount of vanillin in the linen. Vanillin is produced by the thermal breakdown of lignin, a component ofplantmaterial material. Linen from the Dead Sea Scrollstest negative for vanillin; medieval scrolls test positive. The portion of the shroud that was dated with radiocarbon tested positive, but main body of the shroud tested negative, suggesting that the shroud is older than radiocarbon dating suggested. shroud faq 13.htm vanillin.htm Anna Lee
6 If you run a radiocarbon dating laboratory, which artifact you like to analyze? Why? If I ran a radiocarbon dating laboratory, I would analyze artifacts that partner archaeologists send me. If there was a museum of natural history that our museum was associated with, I would analyze any ancient material that hasn t been dated using radiocarbon dating. Anna Lee
7 Homework 5 MacKenzie Sizemore
8 1. What is the oldest timelimitfor using radiocarbon dating? b d b f h Carbon 14 dating is accurate to about 58,000 to 60,000 years. After that point samples are not able to be accurately dated due to age damage.
9 2. A charcoal from a Neanderthal site was found to contain a ration of C14 to C12 was only 9% of that in the fresh wood. How old is this piece of charcoal? The charcoal is approximately 19,900 years old.
10 3. List at least two additional dating methods used in archaeology. Dendrochronology is a method of dating wood samples based on tree ring patterns. It is often accurate to the calendar year. It is used to date old buildings or other archaeological finds. Potassium argon dating is a radiometric dating technique that is used in lava fossil dating. It measures radioactive isotope decay.
11 4. Radiocarbon dating does not yield conclusive result with the date of the shroud of Turin. What are the other methods one can use? While hl the DNA in the blood on the Shroud of Turin is most lk likely l destroyed d from age, testing the areas of the cloth with blood on them and measuring the racemization of the amino acids could provide more accurate results about the age of the Shroud of Turin. Racemization measures the rate at which proteins are converted from L to D forms, which occurs when an organism dies.
12 5. If you run a radiocarbon dating laboratory, which artifact you like to analyze? Why? ld l k l l f h d h l d d h l I would like to analyze samples from the Neanderthal discoveries used to help relate human and Neanderthal DNA. Dating these samples could help provide a better picture of when Neanderthals interacted with humans and how they could have interbred. This dating could help the genomes be better related.
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