List of Contents NUMBER | H. A. Khan and A. A. Qureshi l Solid State Nuclear Track Detection: a useful geologi- cal/geophysical tool C. Papastefanou 39 Alpha radionuclides in ground-level air at a height of 20m K. N. Yu, Z. J. Guan, M. J. Stokes 45 Natural and artificial radionuclides in seabed sediments of and E. C. M. Young Hong Kong Vinay M. Choubey, Rakesh C. Ramola 49 Soil gas and indoor radon studies in Doon Valley, India and Kewal K. Sharma P. J. Jojo, A. Rawat and 55 Enhancement of trace uranium in fly ash Rajendra Prasad S. V. Bodwadkar and J. C. Reis 61 Porosity measurements of core samples using gamma-ray attenuation Ewa Krynicka 79 Correlation between thermal neutron absorption and time decay constant in bounded sample-moderator system N. R. Das, Susanta Lahiri, D. Basu, 85 Nuclear techniques to study the noble metals in the T. K. Baidya and K. L. Chakraborty chromite—sulphide association of Nausahi, Orissa, India A. M. Hassan, N. El-Enany, 91 Multi-element measurements of various industrial samples Z. El-Tanahy and M. A. Abdulmomen by neutron capture prompt gamma-ray activation analysis J. M. Ayala, M. A. Buergo and 99 The use of energy dispersive x-ray fluorescence (EDXRF) J. Xiberta as an approximate method of analysing ash and sulphur content in the coals of the Asturias, Spain J. M. F. Dos Santos and C. A. N. Conde 103 Application of gas proportional scintillation counters to the analysis of sulfur in coal Announcement NUMBER 2 A. E. Abbott, I. Lerche and G. R. Baum 107 Signal processing methods in stable isotope chrono- Stratigraphy: applications to St. Stephen’s Quarry and Bay Minette, AL J. C. Lofts, P. K. Harvey 135 A stochastic approach to mineral modelling of log derived and M. A. Lovell elemental data C. J. Koizumi, J. R. Brodeur, R. K. Price, 149 High-resolution gamma-ray spectrometry logging for con- J. E. Meisner and D. C. Stromswold tamination assessment Joseph R Hearst and Richard C. Carlson 165 A comparison of the moisture gauge and the neutron log in air-filled holes J. C. Reis 173 Fluid injection rates into subsurface formations using radio- active tracers Baljinder Singh and H. S. Virk 185 Investigation of radon-222 in soil-gas as an earthquake precursor Zhang Ye and Ge Liangquan 195 Determination of the ore grade of tunnel walls by in situ x-ray fluorescence analysis NUMBER 3 Motoji Ikeya 201 ESR (EPR) dating based on natural radiation effects G. J. Roach, J. S. Watt, 225 Miultiphase flowmeter for oil, water and gas in pipelines H. W. Zastawny, P. E. Hartley based on gamma-ray transmission techniques and W. K. Ellis D. E. Peplow, R. P. Gardner 243 Sodium iodide detector response functions using simplified and K. Verghese Monte Carlo simulation and principal components Jan A. Czubek 261 Neutron tool calibration by a scaling procedure S. M. Akselrod and L. A. Putkaradze 281 Determination of current and residual oil saturation in old oilfields M. Al-Hilal and M. Mouty 291 Radon monitoring for earthquake prediction on Al-Ghab fault of Syria Alberto Malanca, Valerio Pessina 301 Radon availability from the ground of the Brazilian state of ea+ k and Giuseppe Dallara Rio Grande do Norte E. Navarro and C. Roldan 307 Natural radionuclides in beach sands from the Valencian Community (Spain) Technical Note R. C. Ramola 311 Radon diffusion through mica track filters Announcement N. P. Kocherov and J. S. Schweitzer 313. IAEA Handbook on Nuclear Data for Borehole Logging and Mineral Analysis NUMBER 4 Jan A. Czubek 317 Dead time of dual detector tools Gary L. Mathis 327 A theoretical model for the temperature response of compensated thermal neutron tools Pekka Viitanen 335 Combined use of radioactive and inactive tracers in a borehole experiment M. Borsaru and C. Ceravolo 343 A low activity spectrometric gamma-—gamma_ borehole logging tool for the coal industry T. M. Krishnamoorthy and R. N. Nair 351 Groundwater models for safety analysis of low level radio- active waste repositories M. E. Montero-Cabrera, 361 Multi-elemental characterization of volcanic and vulcano- E. Herrera-Peraza, sedimentary rocks from Pina petroleum ore, central Cuba N. Rodriguez-Martinez, R. Segura-Soto, L. Betancourt-Tanda, R. Campa-Menendez, O. Diaz-Rizo, B. Hernandez-Lopez and S. Valdes-Lopez IV F. Cannizzaro, G. Greco, M. Raneli, 373 Determination of radionuclide concentrations in the air of M. C. Spitale and E. Tomarchio Palermo from the Chernobyl accident to December 1992 J. P. Patel and M. J. Mangala 389 Elemental analysis of carbonatite samples from Mrima Hill, Kenya, by energy dispersive x-ray fluorescence (EDXRF) Pin-Chieh Hsu, Pao-Shan Weng, 395 Relation between radiation exposure rates and geologic Hsiang-En Wang and Po-Wen Tseng ages for the neogene formations in Taiwan K. N. Yu 403 Measurement of radon concentrations in soil in Hong Kong by RaA counting NUMBER 5 Susan L. Herron, 411 Effect of modifying element mineral transforms on Joseph M. Chiaramonte geochemical log interpretation and Michael M. Herron Ewa Krynicka 433 Statistical analysis of a correlation method for thermal neutron absorption cross-section determination Edward R. Landa, Lorin R. Stieff, 443 Intense alpha-particle emitting crystallites in uranium mill Mark S. Germani, Allan B. Tanner wastes and John R. Evans K. F. Sprenke, W. C. Rember, 455 Concentration of '*’Cs in lacustrine sediments of Mud M. C. von Braun and T. W. Erdman Lake, Idaho, U.S.A. J. M. Travassos and A. C. B. Pires 461 The screening effect of a tropical forest on airborne gamma- ray spectrometry A.-M. Jepsen, R. O. Thomsen, 473 On the use of equivalent vitrinite reflectance from the Lower F. G. Christiansen, F. Surlyk Palaeozoic of North Greenland to estimate erosion event and I. Lerche parameters J. P. Bolivar, R. Garcia-Tenorio 485 A generalized transmission method for gamma-efficiency and M. Garcia-Leon determinations in soil samples S. Szegedi, N. El Khayati, I. Szaloki 493 Determination of uranium in rock samples by natural and A. Reggoug gamma-ray spectrometry T. V. Ramachandran 499 Variation of equilibrium factor F between radon and its and M. C. Subba Ramu short-lived decay products in an indoor atmosphere Technical Note M. C. Alvarez Alvarez 505 Equipment for the measurement of natural-gamma and M. T. Dopico Vivero radiation for the analysis of ash content and the content of particular chemical elements in coal NUMBER 6 Gary L. Mathis 507 Diffusion theory and the bed boundary response of thermal neutron logging tools Edward Chrusciel, Nguyen Dinh Chau 521 Coal ash parameters by neutron activation and Jerzy W. Niewodniczanski I. F. Goncalves, J. Salgado, 527. Calibration and design optimization of a nuclear surface J. Neves and F. G. Carvalho moisture-density gauge by Monte Carlo simulation A. Ioannidou and C. Papastefanou 539 Atmospheric beryllium-7 concentrations and sun spots V Said 1. Rabie 545 Distribution and interpretation of radioelements, Wadi Dib area, north Eastern Desert, Egypt Jatinder Kumar, Rajeev Malhotra, 573 Radon measurements in dwellings in radioactive areas in Jaspal Singh and Surinder Singh Himachal Pradesh, India, using LR-I15 plastic track detectors Jaspal Singh, Lakhwant Singh and 577 Estimation of dissolved uranium and radon concentrations Surinder Singh in some natural water systems of Himachal Pradesh, India S. Djeffal, M. Allab, D. E. Cherouati, 583 Further investigations on radon emanation along seismic M. T. Challal and K. Morsli faults in northern Algeria K. N. Yu 593 Radon concentrations in water in reservoirs and streams in Hong Kong K. N. Yu 597 The concentrations of uranium-238 in soil in Hong Kong cSeReeo N eEt VI