========================================================================= Date: Mon, 2 Feb 1998 13:31:22 -0700 Reply-To: jeff.baure@wanadoo.fr Sender: Radiocarbon Mailing List From: David Sewell Subject: Request for basic info on 14C confidence levels Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii [I'm forwarding the attached query we received at RADIOCARBON in hopes that someone may have the time and willingness to offer some response. Please reply to the author of the message, in English or French, not to me or the whole list. Thanks. -David S.] ===================================================================== Date: Sat, 31 Jan 1998 15:40:15 +0100 From: jeff Baure To: c14@packrat.aml.arizona.edu Subject: RadioCarbon Accuracy Hi sir, Before all, please forgive the mistreatments to your language that follow ! We are currently enquiring on a few creationist communities claiming that radiocarbon dating processes and models are relevant only for a time span of 4000-5000 years. A controversy spured by the publishing of a new book about the so called Turin's holly shroud incriminates the carbon 14 dating, claiming a side-check on a snail shell fragment assessed its age to 2500 years. We are far from being specialists of datation processes and technics so if you have any information or references to provide, pertaining to: * the relevancy of the calibration of the C14 dating process, * the fiability of the global carbon cycle models, * the validity of the initial 14C level in the biomass hypothesis or the historical 14C abundance in the atmosphere and the associated cosmic activity * can the nuclear reaction 14N + n = H + 14C be "catalyzed" by specific environmental conditions ? ...or any aspects shaping the confidence level of common datation processes, we would really appreciate ! best, jean-francois UFOCOM SCI. COORD. ADJ. GEN. COORD. ========================================================================= Date: Wed, 4 Feb 1998 10:54:57 -0700 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: David Sewell Subject: New book on AMS Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii We've just received a notice that CRC has published "ACCELERATOR MASS SPECTROMETRY: Ultrasensitive Analysis for Global Science" by C. Tuniz, J.R. Bird, D. Fink and G.F. Herzog. Description and contents are available at CRC's web site: http://www.crcpress.com/catalog/4538.htm David Sewell -- David Sewell, Acting Managing Editor dsew@packrat.aml.arizona.edu RADIOCARBON: An International Journal of Cosmogenic Isotope Research Department of Geosciences, University of Arizona 4717 E. Ft. Lowell Rd., Tucson, Arizona 85712 USA Telephone: +1 520 881 0857 Fax: +1 520 881 0554 WWW server: http://packrat.aml.arizona.edu/ ========================================================================= Date: Fri, 6 Feb 1998 11:12:39 -0700 Reply-To: kuni@ssl.berkeley.edu Sender: Radiocarbon Mailing List From: David Sewell Subject: Postdoctoral 14C Fellowship / U California, Berkeley Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii [Forwarded on behalf of Dr. Nishiizumi; please respond to the address given below, not to me or the C14-L list. --DS] Postdoctoral Fellow Position / Cosmogenic Nuclide 14C. The Space Sciences Laboratory at the University of California, Berkeley seeks applicants for a Postgraduate Research position to work on applications of 14C to problems in nuclear chemistry, earth sciences, and extraterrestrial materials. The successful candidate is expected to develop techniques for the extraction and purification of in-situ produced 14C in terrestrial and extraterrestrial materials. The fields of application include isotope geochemistry, earth surface processes, origin and history of extraterrestrial materials and particle fluxes in space. A strong background in analytical and physical chemistry as well as considerable laboratory experience in vacuum techniques and gas analyses, particularly CO2, is highly desirable. Requirements include a Ph.D. in chemistry or physics. Research locations will be the Lawrence Livermore National Laboratory and the Space Sciences Laboratory at the University of California, Berkeley. A complete curriculum vitae and names and addresses of three references should be sent to Dr. Kunihiko Nishiizumi Space Sciences Laboratory University of California Berkeley, CA 94720-7450 e-mail: kuni@ssl.berkeley.edu Closing date for applications is February 28, 1998. The University of California is an equal opportunity/affirmative action employer. ========================================================================= Date: Mon, 9 Feb 1998 18:24:55 -0600 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List Comments: RFC822 error: Incorrect or incomplete address field found and ignored. From: Luis Cornejo Subject: calibration MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Dear listmembers I am working in organizing the Archaic cronology of the region of Chile (South America) in which I work (Central Area). For thisI have of my own dates calibrated by Beta Analytic for the sites that I have studied, but I need to compare these with other not calibrated dates product of the investigation in the region in the last 20 year. My doubts are the following: 1) can I calibrate in equal way dates on charcol originating of the coast and of land inside? 2) as can calibrate coastal dates accomplished on marine shells or bones of marine animals? 3) is possible to calibrate dates of more than 10.000 antiquity years Would be very useful to listen some advice tanks in advance Luis E. Cornejo B. Museo Chileno de Arte Precolombino Bandera 361 Santiago de Chile Fono (56 2) 6953851 email lcbmchap@reuna.cl ========================================================================= Date: Tue, 10 Feb 1998 10:18:13 -0800 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: Paula Reimer Subject: Re: calibration In-Reply-To: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII On Mon, 9 Feb 1998, Luis Cornejo wrote: > Dear listmembers > > > I am working in organizing the Archaic cronology of the region of Chile > (South America) in which I work (Central Area). For thisI have of my own > dates calibrated by Beta Analytic for the sites that I have studied, but I > need to compare these with other not calibrated dates product of the > investigation in the region in the last 20 year. My doubts are the > following: > > 1) can I calibrate in equal way dates on charcol originating of the coast > and of land inside? You should be able calibrate dates from charcoal originating on the coast the same as from inland sites provided the charcoal is of terrestrial origin. I suppose there are some marine plants that could have been burnt for fuel but hopefully these would have been distinguished from terrestrial plants. > > 2) as can calibrate coastal dates accomplished on marine shells or bones of > marine animals? > To calibrate radiocarbon dates from marine material you must either first make a correction for the age of the carbon in the marine reservoir or use a marine 14C calibration dataset (data from corals and modeled from atmospheric 14C). The global average reservoir correction is about 400 years, but in areas of upwelling, such as off the coast of Chile, the correction is larger. The difference from the global average correction is termed Delta R. A few measurements from shells of known historical age from the coast of Peru and Chile averaged 190 +/- 25 (Berger et al., 1966; compiled in Stuiver et al., 1986). Therefore you would need to subtract 590 years from your radiocarbon ages and increase the standard error to calibrate them with the atmospheric calibration dataset. There are several computer programs available that will handle the marine calibration. You can get a copy of OxCal from the web site at http://www.rlaha.ox.ac.uk or a copy of CALIB (DOS or Mac) from the UW Quaternary Isotope Lab at http://weber.u.washington/~qil. > 3) is possible to calibrate dates of more than 10.000 antiquity years > Yes. The calibration dataset published in 1993 (Stuiver and Reimer, 1993) used U/Th dated coral (Bard et al., 1993) to extend the treering 14C dataset to 14C ages older than 10,000 14C yr BP. It is important to be aware that the uncertainties in the calibration become greater with time due to gaps in the dataset and to the assumptions that were made about global reservoir corrections, etc. If you have any more questions about calibration or difficulties obtaining a copy of CALIB please let me know. Best wishes, Paula Reimer References: Berger, R, Taylor, RE and Libby, W.F., 1966, Science 153:864-866. Bard, E, Arnold, M, Fairbanks, RG and Hamelin, B, 1993, Radiocarbon 35:191-199. Stuiver, M, Pearson, GW and Braziunas, TF, 1986, Radiocarbon 28:980-1021. Stuiver, M, and Reimer, PJ, 1993, Radiocarbon 35:215-230. ****************************************************************** * \ | / * * /\ - ( ) - * * //\\ / | \ Paula J. Reimer * * ///\\\ Quaternary Research Ctr Box 351360 * * ////\\\\ University of Washington * * ____||____ Seattle, WA 98195-1360 * * \~~~~~~~~/ Phone: (206) 543-6327 * * \======/ FAX: (206) 543-3836 * * \====/ e-mail: pjreimer@u.washington.edu * ****************************************************************** ========================================================================= Date: Tue, 10 Feb 1998 19:59:02 -0700 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: rmahood Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" I'm looking for information re. dating Holocene ice cores, specifically: technique(s) used sample collection & size required sample transport method labs equipped to do the work accuracy costs ========================================================================= Date: Wed, 11 Feb 1998 09:10:32 -0700 Reply-To: along@geo.Arizona.EDU Sender: Radiocarbon Mailing List From: Austin Long Organization: Geosciences / University of Arizona Subject: C14 Dating of ice cores MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="------------B7617BC02DEE3F6ED5154678" --------------B7617BC02DEE3F6ED5154678 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Check this reference: Wilson, A.T. Radiocarbon, vol. 37, p. 637-641, 1995. Contact Wilson at A Long rmahood wrote: > I'm looking for information re. dating Holocene ice cores, specifically: > technique(s) used > sample collection & size required > sample transport method > labs equipped to do the work > accuracy > costs --------------B7617BC02DEE3F6ED5154678 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Check this reference:
Wilson, A.T. Radiocarbon, vol. 37, p. 637-641, 1995.
Contact Wilson at <awilson@ccit.arizona.edu>
A Long

rmahood wrote:

I'm looking for information re. dating Holocene ice cores, specifically:
        technique(s) used
        sample collection & size required
        sample transport method
        labs equipped to do the work
        accuracy
        costs
  --------------B7617BC02DEE3F6ED5154678-- ========================================================================= Date: Wed, 11 Feb 1998 16:08:20 -0600 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List Comments: RFC822 error: Incorrect or incomplete address field found and ignored. From: Luis Cornejo Subject: Re: thanks from Chile MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Many thanks to Paula Reimer, Rodger Sparks, Koji Okumura, Ken Brown, Leonid Velarde y Robert H. Tykot for their commentaries and suggestions on my problem about calibration. Saludos desde el sur... Luis E. Cornejo B. Museo Chileno de Arte Precolombino Bandera 361 Santiago de Chile Fono (56 2) 6953851 email lcbmchap@reuna.cl ========================================================================= Date: Mon, 16 Feb 1998 21:58:33 -0800 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: Mark Hall Subject: SUM 14-C or other bootstrapping sub-routine In the 1992 issue of the NEW ZEALAND JOURNAL OF ARCHAEOLOGY, Tom Dye makes reference to his program SUM 14-C which calculates bootstrap intervals for summed probability diagrams. Does anyone know if it is still available by FTP or is still out there somewhere? I checked the SASnet web page and it was not there (in 1992, that is where it was located). Thanks, Mark Hall hall@qal.berkeley.edu ========================================================================= Date: Fri, 20 Feb 1998 10:22:14 +0000 Reply-To: jchartra@bournemouth.ac.uk Sender: Radiocarbon Mailing List From: "Jeffrey A. Chartrand" Organization: ConSci Bournemouth University Subject: GIS Research Officer Post Bmth University Comments: To: ARCHCOMP-L , ARTIFACT , britarch , "LITHICS-L@LISTSERV.ACSU.BUFFALO.EDU" , Arch-l , idrisi-l@mahler.towson.edu, gisarch MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Apologies for Cross Posting..... Research Officer (Early History and Archaeology of the English Channel) £11,562 - £13,871 per annum The School of Conservation Sciences are seeking to appoint a researcher to work on a collaborative project with the Department of Archaeology at Southampton University. With a degree in archaeology, you will examine the human and social impact of the formation and subsequent evolution of the English Channel with reference to the use and exploitation of all environments in, on, under and around it. Undertaking detailed examination of a representative study area you will be expected to develop perspectives and methodologies for more extensive application. Experience of GIS (ARCINFO/INTERGRAPH) and research is essential whilst knowledge of database construction and coastal archaeology would be an advantage. The post holder will be based in Bournemouth but a willingness to travel is required. This is a 1 year fixed term appointment in the first instance. Closing date: Monday 16th March 1998. Informal enquiries may be made to Professor Tim Darvill. tdarvill@bmth.ac.uk Tel. (0) 1202 595536 Further details and an application form are available from the Personnel Department, Bournemouth University, Studland House, 12 Christchurch Road, Bournemouth, Dorset, BH1 3NA. Tel (01202) 310960 (24 hour answer phone), or email personnel@bournemouth.ac.uk. Please quote reference 4274T. Details will be posted on the School Web pages: http://csweb.bournemouth.ac.uk/consci/text/ ========================================================================= Date: Tue, 24 Feb 1998 15:03:15 -0500 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: James Martin Subject: TL dating labs by geographical area In-Reply-To: <19971218112939.00170@packrat> MIME-version: 1.0 Content-type: TEXT/PLAIN; charset=US-ASCII I've been asked to locate the nearest laboratory to Pensacola Florida that performs thermoluminescence dating. Can anyone provide me a name, the address of a TL listserv, or another source where I can find by geographical location labs that do TL? TIA. James Martin Williamstown Center ========================================================================= Date: Tue, 24 Feb 1998 14:59:00 -0600 Reply-To: jhburton@facstaff.wisc.edu Sender: Radiocarbon Mailing List From: J Burton Subject: Re: TL dating labs by geographical area MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; x-mac-type="54455854"; x-mac-creator="4D4F5353" Content-Transfer-Encoding: 7bit You might try the TL resources on the SAS resources page http://www.wisc.edu/larch/sas/facil.htm or the list at: http://is.dal.ca/~digs/links.htm ========================================================================= Date: Fri, 27 Feb 1998 14:32:43 -0500 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: James Martin Subject: pre-1957 vs. post-1957 textile MIME-version: 1.0 Content-type: TEXT/PLAIN; charset=US-ASCII This inquiry pertains to dating a modern painting on canvas that is attributed to an artist who died in 1956. Could radiocarbon dating be used successfully to differentiate pre-1956 cotton or linen from post-1957 (or later) material, as a function of atmospheric concentrations caused by above ground nuclear testing -- assuming an ideal sample? If so, what dates or date pairs _might_ be determined, and what would qualify as an ideal sample (including size)? I may be going out on a limb here ... James Martin WACC 225 South Street Williamstown, MA 01267