Tasks: 1. To measure the impulse counting rate as a function of the distance between the source and the counter tube. 2. To determine the half-value thickness d1/2 and the absorption coefficient of a number of materials by measuring the impulse countAttenuation coefficient of different materials as a function of the material density (from left to right: Plexiglas®, concrete, aluminium, iron, le...

We present a study of the efficiency and optimization of cw second harmonic generation by elliptical Gaussian laser beams. Elliptical focusing slightly improves conversion efficiency and reduces crystal damage risk when heavy walk-off is present. Single-pass measurements of the efficiency for doubling 5 15-nm radiation in beta-barium borate (BBO) agree with theory. Thermal effects, caused by ra...

BACKGROUND Intracoronary brachytherapy is effective in preventing restenosis after coronary interventions. However, in vitro and animal studies have shown that irradiation produces immediate and sustained endothelial dysfunction. This study assesses the clinical relevance of impaired vasomotoric function induced by brachytherapy. METHODS AND RESULTS We analyzed the occurrence of postradiation...

The present study investigated the influence of electromagnetic fields, similar to that emitted by Wi-Fi system, on brain activity. Fifteen female and fifteen male subjects performed a short memory task (Wechsler test), both without and with exposure to a 2.4GHz Wi-Fi signal. For each subject, radiation condition and electrode, the amplitude in the frequency domain of the EEG signal was calcula...

In this work, the effects of beta-radiation are assessed, for the first time, on starch-based biodegradable polymers, with the aim of using it as an alternative sterilization process to the previously studied sterilization methods. Different doses of radiation were used in order to investigate the possibility of using this sterilization technique as a treatment to tailor the surface and bulk pr...

OBJECTIVES This study was done to evaluate the feasibility and efficacy of beta-radiation therapy with a rhenium-188-mercaptoacetyltriglycine ((188)Re-MAG(3))-filled balloon after rotational atherectomy for diffuse in-stent restenosis (ISR). BACKGROUND Rotational atherectomy has been shown to be safe and efficient for the treatment of ISR, but the recurrence rate is still high. Intracoronary ...

BACKGROUND In the porcine overstretch injury model of restenosis, endovascular beta-radiation reduces neointima formation. To determine whether this therapy could be applied to patients with coronary artery disease, a special device was developed to allow delivery of 12 encapsulated 90Sr/Y sources, measuring a total of 30 mm, to various sites within the coronary arterial tree. This study was de...

OF THESIS SYNTHESIS AND CHARACTERIZATON OF CURCUMIN POLYMER FOR APPLICATION IN RADIATION INDUCED LUNG DAMAGE Radiotherapy is used as a primary treatment for many cancers, including lung cancer. Although radiotherapy has proven to be an effective cancer treatment, its use is heavily limited due to the peripheral toxicity to healthy tissue. In this work, the antioxidant, curcumin, was tested as a...

The effects of a myeloablative sublethal 775 cGy 60C gamma radiation exposure on endogenous bone marrow (BM) and splenic granulocyte-macrophage colony-stimulating factor (GM-CSF) and transforming growth factor-beta (TGF-beta) mRNA levels were assayed in B6D2F1 female mice. BM and spleen were harvested from normal mice and irradiated mice on days 2, 4, 7, 10, and 14 after exposure. Cytokine mRNA...

Ionizing radiation affects the metabolism of the nucleic acids (1). The synthesis of deoxyribonucleic acid (DNA), measured by the incorporation of a tracer, is consistently depressed (2) while the response of ribonucleic acid (RNA) is quite variable (3). Since most studies of radiation effects on metabolism have been done with extremely high doses of whole-body x-radiation, the results may be c...