[en] Ionising radiation is finding increasing applications in different areas like basic research, advanced technologies, agriculture, medicine, industry, etc. A major source of this radiation, that is, particle accelerators, turns out to be one of the marvels of scientific invention and technological developments of the last century. This symposium covers different aspects of accelerator applications, safety and related radiat on physics from various angles. Papers relevant to INIS are indexed separately

[en] Accelerators, one of the marvels of the 20^th century are widely used for basic research in science and applications in diverse fields. More than 20 thousand accelerators, both ion and electron types, are used in science driven programmes and employed in high tech areas. Besides basic research in frontier areas, the exciting utility of accelerators in medical, industrial, environmental and nuclear energy programmes is well recognized. In this talk, the increasing use of accelerators in science and technology programmes with special reference to Indian scenario will be brought out. (author)

[en] 'Wetting' and 'dewetting' acquire different meaning when the 'solid' and 'liquid' are composed of similar, complex molecules. A typical case is for amphiphiles forming monolayers and multilayers. These have been studied using X-ray scattering and spectroscopy and some of the results are presented here. Amphiphiles bearing transition elements with unfilled d-orbitals have symmetric co-ordination in the metal-organic moiety and monolayers of these molecules behave as 'liquids' as they are deposited on the multilayers of the same molecules. However, for elements with filled d-orbitals the coordination shows asymmetry and monolayers of such molecules dewet and form nanocrystals as they are similarly deposited, providing a new template for nanocrystal growth. (author)

[en] With the widespread use of nuclear reactors, accelerators and other neutron source facilities (in radiation therapy, material damage studies, production of radioisotopes for nuclear medicines etc.), neutron energy spectrum characterization is of great importance in such facilities. This paper reports use of the genetic algorithm technique - an evolutionary method to search for a single globally optimized solution from a randomly generated population of prospective multi variate solution vectors. We compare the variate results obtained using the genetic algorithm with those obtained using the standard code FERDOR and an iterative technique

[en] Since few years, following the development of laser able to focus ultra short high intensity pulses onto targets became possible the generation of ionizing radiation (X-rays, ions, electrons and protons) by lasers and the development of an innovative, high-gradient acceleration technique based upon such laser. From than on all practices concerning the use of laser in relativistic and ultra relativistic regime have been regarded as practices with radiation risk and consequently treated. The aim of this paper is to focus the radiological protection aspects posed by the the operation of an 'accelerator facility', based on a laser of hundreds terawatt peak power as the LNF FLAME (Frascati Laser for Acceleration and Multidisciplinary Experiments) project in commissioning at LNF. (author)

[en] The multiply backscattering (or reflection) of gamma photons is a problem of fundamental importance in Compton profile, radiation shielding, industrial and medical applications. The parameters called the number and energy albedos give the effect of multiply backscattered radiations on the original signal (incident photon flux) and characterize the reflection probability of a material for gamma photon flux. The present measurements provide Z-dependence of various albedos for 320 and 662 keV incident gamma energies

[en] The indoor radiation exposure to humans is mainly due to radioactive radon gas and emissions from building construction materials. Its transport mechanism therefore calls for innovative investigations. The transport phenomenon of radon through diffusion is a significant contributor to indoor radon entry. The diffusion of radon in dwellings is a process mainly determined by the radon concentration gradient across the building material structure between the radon source and the surrounding air. Keeping this in mind the radon diffusion studies have been made through soil, brick powder and cement. Simultaneously the indoor radon levels have been measured in dwellings with soil, bricks and cemented flooring. (author)

[en] Indus-2 is a 2.5 GeV electron synchrotron radiation source (SRS), which provides a spectrum of photons from Infrared to X-ray region. The Synchrotron Radiation (SR) photons are transported to the experimental station through appropriate beamlines. This paper discusses hutch layout design, standardization of fabrication, shielding material selection, quality checks, installation and subsequent optimization based on calculations, experiments and radiation survey

[en] The shielding design for hadrontherapy facilities is ruled by the secondary radiation field generated by the interaction of the primary beam with the structural materials of the accelerator system and with the patient. This secondary radiation field is constituted mainly by neutrons covering a wide energy range (from thermal energies up to several hundreds MeV per nucleon). The attenuation curves in concrete of secondary radiation generated by 250 MeV protons on iron and by 400 MeV per nucleon carbon ions on copper and carbon were calculated with Monte Carlo simulations. The methods adopted for calculating these attenuation curves will be discussed in this work, together with some outlines for the design of the access maze to the treatment room. The experimental verification of the shielding barriers is a complex task which can be assessed through neutron spectrometry. The results of an inter-comparison on neutron spectrometry held at the CERN-ED High-Energy Reference Field (CERF) in August 2010 will be presented and discussed. (author)

[en] Particle radiation therapy is being increasingly put to use in several countries. Carbon ion therapy facilities are operational in HIMAC and HIBMC Japan while such facilities are planned in CNAO Italy, Heidelberg Germany Gunma University Japan and PTC in Germany. There is a growing concern of latent secondary cancer risks produced as a result of secondary particle interaction outside the treatment volume. In this work, the experimental setup of TEPC detector PI-DOS is simulated to estimate the secondary particle yields and the dose equivalents as is measured by it. The simulations are carried out using the FLUKA Monte Carlo code. The neutron fluence obtained from the simulation is compared with the TOF measurements carried out at GSI