Wyniki wyszukiwania - BazTech

1

Development of diagnostic tools for Plasma Focus derived X-ray source

Angeli E., Bonifazzi C., Da Re A., Marziani M., Tartari A., Frignani M., Mannucci S., Mostacci D., Rocchi F., Sumini M.

Nukleonika

|

2006

|

Vol. 51, nr 1

15-20

EN

The energy spectra of X-rays generated by the impact of electron beams on high- and medium-Z targets following the pinch implosion of Plasma Focus (PF) devices are discussed in terms of the possible mechanisms of X-ray production following electron impact ionization. In addition, the temperature measurement of the PF inner electrode is reported and some results have been proved useful in order to optimize the device functionalities.

2

Preliminary study on X-ray source from Plasma Focus device for fast radiography

Da Re A., Mezzetti F., Tartari A., Verri G., Rapezzi L., Gribkov V. A.

Nukleonika

|

2001

|

Vol. 46, suppl. 1

123--125

EN

Plasma derived flash X-ray sources may find potential applications in medicine and industry. Notwithstanding, as is the case of Plasma Focus (PF) devices, their characterisation in term of photon energy, temporal and spatial beam stability is far to be considered satisfactory. In this work, a radiographic approach, which avoids the effects caused by the intrinsic instability of the pinch output of a PF machine, is proposed and an attenuation curve can be attained even in presence of Xray emission instability. Using two radiographic films for each shot exposition symmetrically positioned and collimated to the pinch region the mean energy of the photons in the X-ray beam are evaluated. The X-ray emission symmetry from the pinch region was then utilised to control the validity of the proposed methodology.

3

An internal standard for Fast Neutron Activation Analysis spectra obtained by means of Plasma Focus devices

Verri G., Tartari A., Rapezzi L., Mezzetti F., Gribkov V. A., Da Re A.

Nukleonika

|

2001

|

Vol. 46, suppl. 1

103--105

EN

The behaviour of Pb activation peaks, which appear in an X-ray spectrum of Fast Neutron Activation Analysis (FNAA) performed by means of a Plasma Focus (PF) neutron source and an NaI scintillator counter, has been studied. The PF device generates neutron bursts of different intensities. To know the exact neutron flux illuminating a sample during PF discharges an external neutron counter is usually used. The nature and behaviour of the indicated peaks suggest that one could use one of them as an internal standard for neutron production measurement instead of an external counter. This technique allows more reliable and accurate determinations of the presence of various elements.

4

Fast Neutron Activation Analysis of gold by inelastic scattering, 197Au(n,n'gamma)197Aum, by means of Plasma Focus device

Verri G., Mezzetti F., Da Re A., Rapezzi L., Gribkov V.

Nukleonika

|

2000

|

Vol. 45, nr 3

189-191

EN

The application of a Fast Neutron Activation Analysis (FNAA) technique on samples of pure gold, irradiated by a plasma focus of 7 kJ, has been investigated. The reaction was the inelastic scattering of neutrons, 197Au(n,n'gamma)197Aum. To avoid problems connected with peculiar features of the neutron emission from this kind of source, a preliminary standardisation of the method has been carried out. The results obtained have a practical interest in view of possible applications to the technology of extraction of minerals.