radioactive carbon वाक्य
उदाहरण वाक्य
मोबाइल
- It measures how much radioactive carbon a living thing has lost since it died or, in the case of anthrax spores, since they went into suspended animation.
- With nuclear physicists'tenuous prediction of a " long-lived radioactive carbon isotope ", Ruben and Kamen pursued several routes that could lead to identification of the carbon-14 isotope.
- A radioactive carbon test performed in Canada several years ago also suggests that the mummy is about 3, 200 years old, give or take a few hundred years.
- The concentric sculptured lines on the shell have been shown by radioactive carbon and oxygen dating to occur annually and have been used to tell the age of the animal.
- This is the second time that pinhead-size samples taken from Dead Sea Scrolls have been submitted to Carbon-14 testing, which measures the age of objects by their radioactive carbon content.
- Plants naturally contain radioactive carbon-14 ( 14 C ), but in a banana containing 15 grams of carbon this would give off only about 3 to 5 beta rays per second.
- Two weeks ago, an FDA advisory committee discussed, then declined to approve, a method that uses radioactive carbon-14, to test for H . pylori in exhaled breath, saying it needed further testing.
- Organic matter in the samples would allow them to use techniques based on radioactive carbon to determine the dates when past quakes have struck _ and thereby to peer into the future.
- Ever since the dawn of the atomic era, scientists have used the decay rate of radioactive carbon to determine the age of organic materials like ancient plants, wooden tools, and human and animal bones.
- The age of this mastodon makes it a rare find but also makes radioactive carbon dating impossible since that is accurate only to about 500, 000 years, according to UNR graduate student Tom Mantean.
- Although the Dyke is conventionally dated to the Early Middle Ages of Anglo-Saxon England, research in recent decades using techniques such as radioactive carbon dating has challenged the conventional historiography and theories about the earthwork.
- The carbon dates ( which depend on the kinds of radioactive carbon atoms in the sample ) are always expressed as a probability, such as : " Two thousand years before present, plus or minus 750 years ."
- Ahmed, 62, was arrested Thursday and charged with illegal possession of radioactive material after investigators seized three briefcases, a suit and a desk all contaminated with radioactive carbon 14 at his home, said Tori Richards, a spokeswoman for the Orange County district attorney.
- Therefore, in D 2 O with natural oxygen, 21 % of neutron captures are on oxygen, rising higher as 17 O builds up from neutron capture on 16 O . Also, 17 O may emit an alpha particle on neutron capture, producing radioactive carbon-14.
- Martin D . Kamen, one of the scientists who discovered radioactive carbon-14 and in doing so helped lay a foundation for deciphering the chemical processes in plants and animals, died on Aug . 31 at his home in Santa Barbara, Calif . He was 89.
- But Goodyear says radioactive carbon dating of small quantities of burned plant remains found deeply buried alongside simple stone tools at the remote Allendale County site appear to confirm that primitive people were there well before the peak of the last ice age, around 22, 000 years ago.
- The scientists used the latest and most sophisticated techniques based on the known decay rates of radioactive carbon in organic material to date the age of the buried vegetation and tree stumps they collected, and they found that none of the samples could have been drowned _ either by subsidence or tsunami _ earlier than 1660 or later than 1730.
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