A measurement data processing method, that will allow increasing detecting sensitivity of XeGRD to gammaradioactive
sources, is considered. Description of a multifunctional portal monitor provided with a xenon gamma-ray
detector (XeGRD) for detection and identification of radioactive and fissile materials is presented. Analysis of
calibration and test results of the XeGRD included in the real portal monitor is presented. It is shown that the xenon
gamma-ray spectrometer can be successfully used in portal monitors for detecting as well as for identification of various
radio-nuclides.
Designs of high pressure xenon gamma-spectrometer with high energy resolution is considered. This device is intended for research of space gamma-radiation and space gamma-bursts. It consists of four independent gamma-detectors which are cylindrical ionization chambers with shielding grids. They are filled with high pressure xenon with density 0.5 g/cm3. Working volume of each chamber is 6000 cm3. Energy resolution of the gamma-spectrometer is 2.5% at energy 662 keV and 1.5% at energy 1170 keV. Its sensitive surface equals to 2500 cm2. It is planned to install the developed instrumentation on the scientific power platform of International Space Station.
The results of research of proton and neutron space radiation fluxes influence on spectrometric characteristics of high pressure xenon gamma-spectrometer (HPXGS) which has been working on board the orbital station 'MIR' since 1990 are submitted. It is shown that energy resolution and test gamma- line position in registered spectra have not practically changed for six years of gamma-spectrometer's work. Other type of HPXGS (the cylindrical ionization chamber) was subjected to neutrons irradiation of Pu-Be source in laboratory conditions. The analysis of these measurement results are given.
Guido Barbiellini, S. Bartalucci, Roberto Bellotti, V. Bidoli, M. Bocciolini, M. Boezio, F. Cafagna, Marco Casolino, M. Candusso, Marcello Castellano, M. Circella, Carlo De Marzo, M. DePascale, A. Galper, S. Koldashov, M. Korotkov, V. Mikhailov, A. Moiseev, Aldo Morselli, Piergiorgio Picozza, A. Popov, M. Ricci, R. Sparvoli, P. Spillantini, P. Spinelli, A. Vacchi, S. Voronov, Nicola Zampa
NINA is the first of three telescopes of the Russian Italian Mission (RIM), devoted through the detection of cosmic rays to the study of galactic and extragalactic astrophysical phenomena. The detector of RIM-1 mission consists of 16 double sided silicon strips. The use of silicon technology is space applications has severel advantages thanks to its low consumption, high signal to noise ratio, low dead area, and no use of gas refueling systems. Indeed these detectors and the electronics used comes from balloon cosmic ray research carried out by the Wizard collaboration in the past years. NINA will be placed in a 700 km polar orbit on the Russian Resource-01 n. 4 satellite by the end of 1996. Solar and galactic cosmic ray nuclei from Hydrogen to Iron in the 10-100 MeV/n region will be studied. In addition to the physical goals, which include the study of anomalous component nuclei inside and outside the radiation belts, technological aspects of this low cost (1.5M dollars) mission will be equally important to the development of the following two steps of RIM mission: PAMELA and GILDA missions--devoted to antimatter and gamma ray research respectively--will make extensive use of the research and development performed with NINA.
The high pressure xenon ionization chamber was designed for measurements gamma-ray lines from cosmic sources. This chamber was installed on board of the orbital station 'MIR' and the measurements are carried out. The 1 liter's chamber was filled with 0.6 g/cm3 density xenon. The energy resolution is 3% FWHM at energy 1 MeV. This experiment has been lasting for about four years on board of the heavy orbital station. Measured background gamma-ray spectra are presented. The background gamma- ray flux is mostly generated by interaction of cosmic rays with the vessel mass. A considerable abundance in energy region 170- 260 keV was registered. This abundance is produced by the radioactive source located in uranium shield on board of transport spacecraft. Also the 511 keV annihilation line was observed. Its intensity has obvious latitude dependence. Therefore it is generated by interaction of cosmic ray with the vessel matter. The strong gamma background decreases significantly the instrument sensibility to gamma-ray bursts.
Yu. Yurkin, Aleksey Bolotnikov, I. Chernycheva, Valery Dmitrenko, A. Galper, V. Grachev, O. Kondakova, S. Krivov, V. Lyagushin, G. Shmatov, S. Sutchkov, Sergey Ulin, Z. Uteshev, K. Vlasik
The high pressure xenon ionisation chamber was designed for measurements gamma-ray lines from cosmic sources in the energy range 0.1 - 10 MeV. This chamber was installed on board of the orbital station "MIR" and the measurements are carried out. The 3 litter's chamber was filled with 0.6 'ifcm3 density xenon mixed with hydrogen for increasing the drift velocity of electrons. The energy resolution is 1.3% FWHM at photon energy I MeV without electronics noise (2.00/o total). This experiment has been lasting for about three years without any degradation although the detector is strongly irradiated traversing the South-Atlantic anomaly four times a day. The high energy resolution of xenon ionisation chamber made it possible to register lines in gamma-ray bursts energy spectra. Up to this time we have observed events with ~Fe* deexitation and red-shifted 511 keV annihilation lines. This experiment is carried out on board of the heavy orbital station. The distortion of measured data by the induced in vessel mass radioactivity is measured. Also we discuss the influence of vil<ration and acoustic noise.
Valery Dmitrenko, Aleksey Bolotnikov, I. Chernycheva, A. Galper, V. Gratchev, O. Kondakova, S. Krivov, S. Sutchkov, Sergey Ulin, Z. Uteshev, K. Vlasik, Yu. Yurkin
A high pressure xenon parallel plate ionization chamber was designed for measurements of cosmic gamma-ray lines. The 3 liter chamber was filled with 0.6 g/cu cm density of xenon, mixed with hydrogen for increasing the drift velocity of the electrons. The noise-subtracted energy resolution was 1.3 percent FWHM at energy 1 MeV. This chamber was installed on the space station 'MIR', currently in orbit and the measurements are being carried out. No energy resolution degradation has been observed for two years, despite the strong irradiation by the Brazil anomaly.
Valery Dmitrenko, Aleksey Bolotnikov, A. Galper, V. Gratchev, Sergey Ulin, O. Kondakova, Vadim Komarov, S. Krivov, S. Suchkov, Z. Uteshev, Yu. Yurkin, K. Vlasik
The construction of a cylindrical ionization chamber, filled with high pressure xenon (55 bar) is described. The main characteristics of this detector are given. It is shown that the energy resolution of this detector, at 662 keV, is 4% FWHM for the optimal parameters of the gas mixture, applied electric field and shaping time. The detector was tested within a temperature interval between 20°C and 170°C. The dependence of the energy resolution of the cylindrical gamma-ray detector is quite stable. This detector can be used in geology, geophysics, oil and gas well logging.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.