LOCALISATION AND MEASUREMENT BY X RAYS.

Localisation of Foreign Bodies by X Rays

plate, and by reproducing mechanically, by means of silk threads, the course of the rays, he is enabled to exactly localise in the three dimensions of space, the position of the foreign body. Some further details of this method were now given. The only objection to this process is that it is lengthy and that the apparatus is expensive?a set costing about ? I o, I os. There is, however, a much s...

Measurement of stereotactic beam data of 9 MV X-rays using diode detector

Background: Radiosurgery is a focal brain irradiation technique that delivers, usually in a single session, high dose of ionizing radiation. The presence of lateral electronic disequilibrium and steep dose gradients in small fields demands special attention to the selection of a suitable detector with respect to its size, composition and response. Materials and Methods : Small circular fields w...

Chemical Analysis by X-Rays

Spatial Profile Measurement of Femtosecond Laser - Compton X-rays

A femtosecond X-ray source was developed by Thomson scattering through interaction between a lowemittance picosecond electron beam and a terawatt femtosecond laser light at 90 configuration. The observed X-ray intensity with peak energy of 2.3 keV and pulse duration of 270 fs rms was typically 1.4x10 photons/pulse. The pulse-to-pulse fluctuation of the X-ray intensity was measured to be 25%. Th...

Measurement of 63 Ni and 59 Ni by accelerator mass spectrometry using characteristic projectile X - rays

The long-lived isotopes of nickel (Ni, Ni) have current and potential use in a number of applications including cosmic radiation studies, biomedical tracing, characterization of low-level radioactive wastes, and neutron dosimetry. Methods are being developed at LLNL for the routine detection of these isotopes by AMS. One intended application is in Hiroshima dosimetry. The reaction Cu(n,p)Ni has...