D Woodhead

Publications (5)8.2 Total impact

• Article: A new Certified Reference Material for radionuclides in Irish sea sediment (IAEA-385).

  M K Pham, J A Sanchez-Cabeza, P P Povinec, K Andor, D Arnold, M Benmansour, I Bikit, F P Carvalho, K Dimitrova, Z H Edrev, [......], J Palomares, G Pantelic, J Pfitzner, R Pilvio, L Puskeiler, H Satake, J Schikowski, G Vitorovic, D Woodhead, E Wyse
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  ABSTRACT: A new Certified Reference Material (CRM) for radionuclides in sediment (IAEA-385) is described and the results of the certification process are presented. Eleven radionuclides ((40)K, (137)Cs, (226)Ra, (228)Ra, (230)Th, (232)Th, (234)U, (238)U, (238)Pu, (239+240)Pu and (241)Am) have been certified and information mass activities with 95% confidence intervals are given for seven other radionuclides ((90)Sr, (210)Pb((210)Po), (235)U, (239)Pu, (240)Pu and (241)Pu). Results for less frequently reported radionuclides ((60)Co, (99)Tc, (134)Cs, (155)Eu, (224)Ra and (239)Np) and information on some activity and mass ratios are also reported. The CRM can be used for quality assurance/quality control of the analysis of radionuclides in sediment samples, for the development and validation of analytical methods and for training purposes.
  Applied Radiation and Isotopes 06/2008; 66(11):1711-7. · 1.17 Impact Factor
• Article: Marine radioactivity assessment of Mururoa and Fangataufa atolls

  P. P. Povinec, D. Woodhead, P. Blowers, R. Bonfield, M. Cooper, Q. Chen, H. Dahlgaard, C. Dovlete, V. Fox, K. Froehlich, [......], A. Krüger, L. L. Kwong, M. Matthews, U. Morgenstern, S. Mulsow, H. Pettersson, P. Smedley, B. Taylor, C. Taylor, R. Tinker
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  ABSTRACT: The International Atomic Energy Agency (IAEA) carried out an international project. 'The Study of the Radiological Situation at the Atolls of Mururoa and Fangataufa' with the aim of assessing the present and future radiological situation at the atolls and making recommendations for either monitoring or remedial actions if they are deemed necessary. The paper concentrates on marine radioactivity aspects and gives an estimation of present radionuclide concentrations in water, sediment and biota of the Mururoa and Fangataufa lagoons and the surrounding ocean. The dominant radionuclide in both lagoons is Pu in sediments (the total inventory is approximately 30 TBq). A decline in radionuclide concentrations has been observed in recent years in lagoon water, with the exception of 3H and 90Sr, for which a contribution from underground sources is to be expected. Radionuclide concentrations in biota from the lagoons and the surrounding ocean are low and consistent with previous measurements. The observed radion
  Science of The Total Environment 01/1999; 237-238:249-267. · 3.29 Impact Factor
• Article: Rates of accumulation of dieldrin by a freshwater filter feeder: Sphaerium corneum.

  M Boryslawskyj, A C Garrood, J T Pearson, D Woodhead
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  ABSTRACT: The rate of dieldrin accumulation by Sphaerium corneum was determined in the field and under controlled conditions in the laboratory. The methods gave comparable results and it was established that Sphaerium attained an equilibrium concentration of dieldrin in its tissues in a short time period and exhibited a bioaccumulation factor of 1000. The rate of dieldrin accumulation by direct uptake from dieldrin in solution was compared to the rate obtained for indirect uptake from dieldrin adsorbed onto particulate material. The primary route of dieldrin uptake into Sphaerium was shown to be by direct partitioning of residues into lipoidal tissues from water. The effect of temperature on the rate of accumulation was also studied. The rate of accumulation increased with temperature in the range 5 degrees C to 20 degrees C. The frequency of gill cilia beat in relation to accumulation rate was studied in this temperature range and a correlation is shown.
  Environmental Pollution 02/1987; 43(1):3-13. · 3.75 Impact Factor
• Article: Health Survey - disadvantaged schools.

  R W Roberts, J Mack, D Woodhead
  Australian paediatric journal 04/1976; 12(1):31-6.
• Article: Computer assisted analysis of cryptic crosswords

  P. W. Williams, D. Woodhead
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  ABSTRACT: An analysis of the structure of cryptic crossword puzzle clues is developed and a formal definition using a notation similar to BNF is provided. The language LACROSS seems to describe nearly all cryptic clues in British daily newspapers. The clues are made up of components of the solution and operators describing how the components are put together. A computer program is described which gives the possible interpretations of the words of the clue by using two main dictionaries, one of frequently used abbreviations and one of indicator words in the clues showing the possible operators and components. The complete BNF type definition of the LACROSS language is given and examples of output from the computer analysis program are presented.