========================================================================= Date: Mon, 12 May 2003 16:19:49 -0700 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: "Agnieszka P. Baier" Organization: Meteoritics & Planetary Science Subject: Abstracts deadline extended MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Dear Colleagues: Due to a number of requests, the deadline for abstracts for the 18th International Radiocarbon Conference has been extended to JULY 1st 2003. Please note that this is also the deadline for early bird registration. You can register online and submit abstracts by clicking this link http://www.gns.cri.nz/14conference2003/ While we expect the bulk of Registration and Abstract submission to be made via the Web, on-line forms may also be downloaded and posted. If you do have any problem accessing this site, please send us a message at 14Conf-info@gns.cri.nz We look forward to seeing you all in Wellington in 2003. Wellington 2003 Conference Organizing Committee =========================================================================== To unsubscribe from this list, send the command SIGNOFF C14-L to LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L-request@LISTSERV.ARIZONA.EDU. ========================================================================= Date: Fri, 16 May 2003 12:45:10 +0100 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: "M.Kaplan" Subject: mean of solution ranges? In-Reply-To: <1YPNFDOKOMKIHTQC41MIGC04C9LLI.3e624537@ABULAFIA> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Dear Colleagues, Is there a way to calculate a mean or weighted mean-like solution range from a list of age calibrations (and reference)? In other words, after you have calibrated your radiocarbon ages and have each associated age in cal ka BP with its solution range, is there a method by which it is OK to calculate a mean? I do not believe this is "allowed," at least not in the "typical way" of taking a mean or weighted mean. I feel as if I should already know the definitive answer to this question but thought I would check with the list. Sincerely, Mike Kaplan School of GeoSciences University of Edinburgh Drummond Street Edinburgh, EH8 9XP Scotland, UK 44 (0) 131 650 9140 =========================================================================== To unsubscribe from this list, send the command SIGNOFF C14-L to LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L-request@LISTSERV.ARIZONA.EDU. ========================================================================= Date: Sat, 17 May 2003 17:07:41 +0200 Reply-To: al026@uni-koeln.de Sender: Radiocarbon Mailing List From: Bernhard Weninger Subject: Re: mean of solution ranges? In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Dear Mike, and Collegues, I judge there exist two extreme case answers to this question, as well as a wider spectrum of applicable methods. The first extreme answer is indeed "no", just as you propose. The second answer is indeed "yes", again just as you propose. The first answer is no, because if we apply the calibration operation "cal" to any two 14C-ages a and b, the fundamental equation underlying the requested averaging/weighting of the calibrated results cal(a) and cal(b) on the calendric scale would be something of the like cal(a+b) = cal(a) + cal(b) but which ist not valid, due to the existence of multiple exclusive cal-age readings. The alternative answer is Yes: derive a weighted average 14C-age for the two 14C-ages, on the 14C-scale Then calibrate the result. Furthermore, we can also adapt other methods to this question, and from a wider view-point the above two answers appear to represent the extreme cases in a much wider spectrum. For example, we can wiggle match the two dates under study to the cal-curve, by applying a calendric-age distance "0" yrs. Indeed, such a method has the advantage that the underlying hypothesis "equal calendric age" can be applied with much more flexibility, and - most important - we can then loosen the assumption "distance = exactly 0 yrs" down to "distance = 0 +/- 20yrs" or even "0 +-30 yrs" etc etc which gives us altogether the possibility to calculate weighted cal-age results for a much wider spectrum of archaeological find-situations e.g. fire-place containing a lump of charcoal and an animal bone. The OxCal-program offers you a large number of variations on this theme, and allows you to further generalise the data input resp. combine more assumptions. I myself run the above wiggle matching "equal-age plus-minus" method quite routinely to any new archaeological data set, which comes my way, using the "Gaussian Monte Carlo Wiggle Matching" procedure incorporated in the CalPal-package. However, carefully rereading your question, I would advise you please to be cautious about other peoples calibrations ! Research papers that only publish calibrated ages, and leave away the original 14C-ages, are sometimes best put aside. Whatever, all the above methods only operate with input of 14C-ages. Bernhard Weninger ***********************************************************'' >Is there a way to calculate a mean or weighted mean-like solution range >from a list of age calibrations (and reference)? In other words, after you >have calibrated your radiocarbon ages and have each associated age in cal >ka BP with its solution range, is there a method by which it is OK to >calculate a mean? > >I do not believe this is "allowed," at least not in the "typical way" of >taking a mean or weighted mean. Ifeel as if I should already know >the definitive answer to this question but thought I would check with the >list. > >Sincerely, > >Mike Kaplan > >School of GeoSciences >University of Edinburgh >Drummond Street >Edinburgh, EH8 9XP >Scotland, UK >44 (0) 131 650 9140 > >============================================================================ >To unsubscribe from this list, send the command SIGNOFF C14-L to >LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L- request@LISTSERV.ARIZONA.EDU. > **************************************** Dr. Bernhard Weninger Universität zu Köln Radiocarbon Laboratory Institut der Vor- und Frühgeschichte Weyertal 125 D-50923 KÖLN Germany --------------------------------------- Tel. (+) 221 470 2880 Laboratory Fax. (+) 221 470 4892 Secretary mail: b.weninger@uni-koeln.de site: www.calpal.de/ **************************************** =========================================================================== To unsubscribe from this list, send the command SIGNOFF C14-L to LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L-request@LISTSERV.ARIZONA.EDU. ========================================================================= Date: Mon, 19 May 2003 12:48:18 +0300 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: Stamoulis Kostas MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01C31E04.EBCEB1C0" This is a multi-part message in MIME format. ------=_NextPart_000_0014_01C31E04.EBCEB1C0 Content-Type: text/plain; charset="iso-8859-7" Content-Transfer-Encoding: quoted-printable Dear all, =20 We measure rainwater samples for tritium concentration. Is anybody know = the levels of tritium in rainwater nowadays around the Mediterranean? If = so could you please be kind and send us some values for checking our = results =20 Thanks in advance, =20 Dr Stamoulis Kostas =20 =20 =20 =20 Archaeometry Centre Tritium Laboratory University of Ioannina Ioannina 45110 Greece Tel: +302651098547 Fax: +302651068692 E-mail: kstamoul@cc.uoi.gr =20 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D To unsubscribe from this list, send the command SIGNOFF C14-L to LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L-request@LISTSERV.ARIZONA.EDU. ------=_NextPart_000_0014_01C31E04.EBCEB1C0 Content-Type: text/html; charset="iso-8859-7" Content-Transfer-Encoding: quoted-printable

Dear=20 all,

 

We measure=20 rainwater samples for tritium concentration. Is anybody know the levels = of=20 tritium in rainwater nowadays around the Mediterranean? If=20 so could you please be kind and send us some values for checking our=20 results

 

Thanks in=20 advance,

 

Dr=20 Stamoulis Kostas

 

 

 

 

Archaeometry=20 Centre

Tritium=20 Laboratory

University = of=20 Ioannina

Ioannina

45110

Greece

Tel:=20 +302651098547

Fax:=20 +302651068692

E-mail:=20 kstamoul@cc.uoi.gr

 

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D To unsubscribe from this list, send the command SIGNOFF C14-L to LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L-request@LISTSERV.ARIZONA.EDU. ------=_NextPart_000_0014_01C31E04.EBCEB1C0-- ========================================================================= Date: Mon, 19 May 2003 11:25:47 -0400 Reply-To: barclayd@cortland.edu Sender: Radiocarbon Mailing List From: David Barclay Organization: SUNY Cortland Subject: Re: mean of solution ranges? MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hi Mike, You may find these papers useful for your question: Ward, G.K. and Wilson, S.R., 1978, Procedures for Comparing and Combining Radiocarbon Age Determinations: A Critique; Archaeometry v.20, p.19-31. Wilson, S.R. and Ward, G.K., 1981, Evaluation and Clustering of Radiocarbon Age Determinations: Procedures and Paradigms; Archaeometry, v.23, p.19-39. The first paper describes how to test whether multiple ages are indeed statistically the same and, if so, the correct procedure for calculating a pooled mean and variance. Hope this helps. -- David Barclay - Assistant Professor Department of Geology, SUNY Cortland Cortland, NY 13045 ph:(607)753-2921 fx:(607)753-2927 barclayd@cortland.edu http://web.cortland.edu/barclayd/INDEX.HTM "M.Kaplan" wrote: > > Dear Colleagues, > > Is there a way to calculate a mean or weighted mean-like solution range > from a list of age calibrations (and reference)? In other words, after you > have calibrated your radiocarbon ages and have each associated age in cal > ka BP with its solution range, is there a method by which it is OK to > calculate a mean? > > I do not believe this is "allowed," at least not in the "typical way" of > taking a mean or weighted mean. I feel as if I should already know > the definitive answer to this question but thought I would check with the > list. > > Sincerely, > > Mike Kaplan > > School of GeoSciences > University of Edinburgh > Drummond Street > Edinburgh, EH8 9XP > Scotland, UK > 44 (0) 131 650 9140 > > ============================================================================ > To unsubscribe from this list, send the command SIGNOFF C14-L to > LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L-request@LISTSERV.ARIZONA.EDU. =========================================================================== To unsubscribe from this list, send the command SIGNOFF C14-L to LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L-request@LISTSERV.ARIZONA.EDU. ========================================================================= Date: Mon, 26 May 2003 12:30:43 +0200 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: Uwe Danzeglocke Subject: CalPal - Radiocarbon Calibration: 12th update MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Apologies for cross-posting Dear Colleagues, We have recently updated the CALPAL program (Cologne Radiocarbon Calibration & Palaeoclimate Research Package). The new version includes a dialog called the CalCurveComposer (CCC), and an upgrade of the Calpal Radiocarbon Calibration Curve (CC=Calpal2003). With the CCC you now have fingertip control over the construction of (max 100) Glacial and Holocene radiocarbon calibration curves, with complete quantitative error analysis on both time scales (14C and calendric) in the age range 0-60 ka. Data entry is based on an ADD/REMOVE dialog for an input of (max) 100 different calibration data files with (max) 10000 dates. CC construction options are: a) SELECTION of CC data files. b) CHOICE of SYMBOLS, COLOURS and SIZE of error bars. c) CHOICE of CC data interpolation METHOD (splines, polynomials). d) SLIDER-CONTROL of CC spline stiffness. e) NAME of new CC. f) STORAGE of CC-data, interpolation method, and error function. g) DELETE Function for new CC’s considered obsolete. The output of the CCC is an immediately working CC in the age range covered by the selected data (e.g. 0 to 60 14C-ka). CalCurve errors are based on a (smoothing) polynomial of 6th order run through the (14C-age) differences between entered caldata and constructed CalCurve. Note that, as a rule, the CC-errors increase with the selected CC-smoothness. As a first application, we have used the new CCC to build an updated Glacial CC (called CalPal2003), based on the following data sets: INTCAL98-tree, Barbados U/TH-corals, PS2644, Suigetsu_1, Suigetsu_3, and Cariaco_ 2000. The new CalPal2003 is similar to the now obsolete CalPal2001 for ages 0-25 ka 14C-BP, but is constructed to be smoother in the age-range 25-28 ka 14C-BP (i.e. the European Gravettian). Once the relevant data sets have been entered, it takes little more than a few “clicks” to produce an updated CC. The program can be downloaded (scientific freeware) from http://www.calpal.de Best regards B. Weninger, O. Jöris, U. Danzeglocke ************************************ Institut für Ur- und Frühgeschichte Radiocarbon Laboratory Universität zu Köln Weyertal 125 50923 Köln Germany Tel. (+49) 221 470 2880 Fax. (+49) 221 470 4892 Site http://www.calpal.de ************************************ =========================================================================== To unsubscribe from this list, send the command SIGNOFF C14-L to LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L-request@LISTSERV.ARIZONA.EDU.