Routine diagnostic X-rays (e.g., chest X-rays, mammograms, computed tomography scans) and routine diagnostic nuclear medicine procedures using sparsely ionizing radiation forms (e.g., beta and gamma radiations) stimulate the removal of precancerous neo-plastically transformed and other genomically unstable cells from the body (medical radiation hormesis). The indicated radiation hormesis arises...

Gated and streak cameras have been used to look at a high current focused electron beam on a target, and the x-rays produced by that interaction. An optical camera images the optical transition radiation (OTR) from the beam hitting a carbon target to give focused beam profiles. Blackbody radiation from heavy metal targets is experimentally proven to be dominant. The roll bar technique is used a...

Investigations were carried out to estimate the level of radiation exposure effect of X-ray machines on 40 male personnel handling diagnostic X-ray machines and compared to 38 matched, unexposed, normal controls. The actual accumulated radiation doses were not disclosed. As compared to controls the exposed persons showed highly significantly increased levels (P < 0.01) of chromosome aberrations...

one of the most common positioning errors in panoramic radiography is palatoglossal air space above the apices of the root of maxillary teeth. it causes a radiolucency obscuring the apices of maxillary teeth. in the case of this positioning error, the imaging should be repeated. this causes the patient be exposed to radiation again. to avoid the repetition of exposing harmful x-rays to the pati...

Spectra of Xand g-rays emitted by radioactive sources and of the radiation emitted by X-ray tubes, in the energy range 15±160 keV, have been measured with a silicon PIN photodiode at room temperature. The experimental Xray tube spectra are compared with calculated ones on the basis of a semi-empirical model. Results indicate that the method utilized is adequate for the characterization of X-ray...

A multi-purpose soft x-ray array diagnostic system was developed for measuring two-dimensional x-ray emissivity profile, electron temperature, Ar impurity transport, and total radiation power. A remotely controlled filter wheel was designed with three different choices of filters. The electron temperature profile can be determined from the ratio of two channels having different thickness of Be ...

Ionizing radiation is an invisible threat that cannot be seen, touched or smelled and exists either as particles or waves. Particle radiation can take the form of alpha, beta or neutrons, as well as high energy space particle radiation such as high energy iron, carbon and proton radiation, etc [1]. Nonparticle radiation includes gammaand x-rays. Publically, there is a growing concern about the ...

INTRODUCTION The NCRP 49 (1976) (1) standard presents a methodology to determine protective shielding for diagnostic and therapeutic X-ray rooms. This methodology has been reviewed by several authors in the recent years (2). This work presents contributions for this new shielding evaluation method, taking into account information regarding patient attenuation and scattering, as well as workload...

Introduction Application of quality control (QC) programs at diagnostic radiology departments is of great significance for optimization of image quality and reduction of patient dose. The main objective of this study was to perform QC tests on stationary radiographic X-ray machines, installed in 14 hospitals of Kerman province, Iran. Materials and Methods In this cross-sectional study, QC tests...