Decay Data Evaluation Project

1

• Decay Data Evaluation Project

- Status - Working programmes - Plans
2
DDEP Training Workshop
The first DDEP Training Session was held in
Saclay from March 6 to 10, 2006, 16 participants
from 10 countries attended.

• - Lectures on evaluation and statistical analysis
  of data were given
• Practical sessions to use computer codes were
  organized
• Specific evaluations were presented
• a visit to the Bureau International des Poids et
  Measures (BIPM) was organized, where Prof.
  Moscati welcomed the participants.

3
List of evaluated nuclides

• 1) First volume 1999
• 3H, 14C, 22Na, 26Al, 35S, 36Cl, 40K, 55Fe, 58Co,
  60Co, 65Zn, 68Ga, 68Ge, 75Se, 95Zr, 95Nb, 95Nbm,
  111In, 113Inm, 113Sn, 123Tem, 125I, 137Cs, 139Ce,
  141Ce, 188Re, 192Ir, 194Ir, 207Bi.
• 2) Two volumes of the Monographie BIPM-5, 2004
• 7Be, 11C, 13N, 15O, 18F, 24Na, 32P, 33P, 44Sc,
  44Ti, 46Sc, 51Cr, 54Mn, 56Mn, 57Co, 57Ni, 59Fe,
  64Cu, 66Ga, 67Ga, 85Kr, 88Y, 89Sr, 93Nbm, 99Mo,
  99Tcm, 109Cd, 110Ag, 110Agm, 123I, 123Tem, 125Sb,
  129I, 131I, 131Xem, 133Ba, 140Ba, 140La, 152Eu,
  153Gd, 153Sm, 154Eu, 155Eu, 166Ho, 166Hom, 169Yb,
  170Tm, 177Lu, 201Tl, 203Hg, 204Tl, 208Tl, 212Pb,
  212Bi, 212Po, 216Po, 220Rn, 224Ra, 226Ra, 227Th,
  228Th, 238Pu, 240Pu, 241Am, 242Pu.
• 3) The third volume of the Monographie BIPM-5 was
  published in 2006
• 3H, 55Fe, 56Co, 60Co, 63Ni, 65Zn, 79Se,
  90Sr, 90Ym, 90Y, 108Agm, 108Ag, 111In, 125Sb,
  137Cs, 153Sm, 159Gd, 203Pb, 233Pa, 233Th, 234U,
  236Np, 236Npm, 237U, 238U, 242Cm, 243Am, 244Cm.

4
In preparation

• Planned
• a new Monographie volume in October 2008
• Are available
• 133I, 133Xe, 133Xem, 139Ce, 206Tl, 210Tl, 210Pb,
  210Bi, 214Pb, 214Po, 214Bi, 218At, 218Rn, 218Po,
  222Rn, 226Ra, 237Np, 238Np, 239U, 239Np, 239Pu,
  241Pu, 246Cm, 252Cf.

5
Importance of the Monographie publication

• Bureau International des Poids et Mesures (BIPM)
• The Convention of the Metre (Convention du Mètre)
  is a treaty which gives authority to the General
  Conference on Weights and Measures (CGPM), the
  International Committee for Weights and Measures
  (CIPM) and the International Bureau of Weights
  and Measures (BIPM) to act in matters of world
  metrology, particularly concerning the demand for
  measurement standards of ever increasing
  accuracy, range and diversity, and the need to
  demonstrate equivalence between national
  measurement standards.
• The principal activities of the BIPM in the field
  of ionizing radiation are to maintain the
  international reference standards for dosimetry
  and activity measurements. These standards are
  used in the BIPM key comparisons and their
  development and improvement is a major part of
  the research and development programme.

6
BIPM Monographies

• A series of monographs is published by the BIPM
  on behalf of the Consultative Committee for
  Ionizing Radiation (CCRI). The aim of this series
  of publications is to review various topics that
  are of importance for the measurement of ionizing
  radiation and radioactivity, in particular, those
  techniques normally used by participants in
  international comparisons. It is hoped that these
  publications will prove to be useful reference
  volumes both for those who are already engaged in
  this field and for those who are approaching such
  measurements for the first time.
• The purpose of this monograph, number 5 in the
  series, is to present the recommended values of
  nuclear and decay data for a wide range of
  radionuclides.

7
DDEP Rules for evaluation

• Main stages
• critical analysis of published results
• Results without uncertainties are not used
• One result per laboratory included
• Rejection of some values is always discussed
• Private communications are, a priori, not
  accepted, except in the exceptional case where
  there is no published value available
• Some uncertainties affecting individual results
  can be revisited in the light of the Guide to
  the expression of uncertainty measurement (BIPM
  GUM)
• Statistical process

8
Information

• The next ICRM conference will be held in
  Bratislava
• Dates will be end of May, beginning of June
• See http//www.smu.gov.sk/eng/main.html
• Conference topics
• Nuclear decay data
• Gamma spectrometry
• Alpha and beta spectrometry
• etc.
• In all your publications dont forget
• to provide the reader/evaluator with a full
  "Uncertainty Budget" in tabulated form, as
  recommended by the ICRM scientific committee

9

• Many thanks to the IFIN Team for hosting this
  second DDEP working session