Recent progress in emulsion technology to study fragmentation reactions of high energetic ion beams

Abstract

The R&D project to study nuclear fragmentation using emulsion in attempt to improve the accuracy of dose calculation in carbon ion radiotherapy has been carried out at NIRS-HIMAC since 2003. Based on the developed techniques, we are accumulating experimental data of fragmentation reactions for various beams and target Preprint submitted to Elsevier Science 11 December 2008combinations. In this programme we are also developing the practical application of hybrid apparatus of emulsion and CR-39, and performing basic study of gold deposition development in order to improve measurement of ionization.

Detection of Radiation Tracks Recorded on Silver-Salt Photographic Materials by Fluorescence-Labeling Method

“…[2][3][4] Information obtained from the analysis of tracks is widely used for basic studies in particle physics, such as the detection of neutrino oscillations 5,6) or dark matter research. 7) Moreover, this information is utilized in application areas such as radiation dose measurement for beam cancer therapy by the analysis of nuclear fragmentation reactions 8,9) or perspective on volcanoes by cosmic-ray muon-radiography. 10,11) Thus, the use of silver-salt photographic materials is an important technology in particle physics and other fields.…”

Discriminated Detection of Nuclear Tracks Recorded on Multilayers of Photographic Emulsions with Different Sensitivities by Color-Development Method

“…9,10) We developed some techniques for these nuclear plates to analyze the tracks, such as color development, [11][12][13][14] golddeposition development, 15,16) hybrid systems of CR-39 plastic detectors and nuclear plates, 17) and so on. 18) When a high-energy particle passes through an emulsion layer of silver-salt photographic material, silver halide grains in the layer become developable, and a track of the particle is recorded as a row of developed silver grains with high spatial resolution. The number of developed silver grains formed on a unit length of the track, the so-called grain density (GD), provides information on the deposit energy of the particles, which is useful for their charge identification.…”