title: Gamma photon techniques for detection of nucleation in superheated emulsion detectors for neutron dosimetry.
abstract: Application of transmission and scattering gamma photon techniques for calibration of superheated emulsion detectors used for neutron dosimetry is described. The bubbles nucleated in the detector due to neutron exposure generate detectable changes in both attenuation and scattering properties of the medium, and the magnitude of change in properties depends on population density of bubbles nucleated and in turn is proportional to neutron dose. The experimental set-up consists of (137)Cs and (241)Am sources and an HPGe detector-based gamma-ray spectrometer. An indigenously developed bubble detector and a commercially available one (BTI, Canada) are used in the present study. Theoretical models for the variation in transmitted and scattered intensities through the bubble detector as a function of neutron dose are formulated, and the experimental results obtained are found to be in good agreement with the models. In the neutron dose region studied, the transmission technique shows better sensitivity than scattering technique.
authors.affiliation: Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India.
authors.forename: P
authors.initials: P
authors.lastname: Priyada
authors.forename: R
authors.initials: R
authors.lastname: Ramar
authors.forename: H
authors.initials: H
authors.lastname: Krishnan
authors.forename: S
authors.initials: S
authors.lastname: Viswanathan
authors.lastname: Shivaramu
mesh_terms: D002138:Calibration; D002588:Cesium Radioisotopes / Q000032:analysis; D005720:Gamma Rays; D006801:Humans; D009502:Neutrons; D017785:Photons; D011197:Potassium Radioisotopes / Q000032:analysis; D011834:Radiation Monitoring / Q000295:instrumentation* / Q000379:methods; D011835:Radiation Protection / Q000295:instrumentation*; D011874:Radiometry
chemical_list: D002588:Cesium Radioisotopes; D011197:Potassium Radioisotopes