Ionizing radiation

The primary aims of this thesis are: A) to measure the dependence of the DAPR20,10 on the size of the primary small photon field, and to relate this data to TPR20,10 of the reference field. B) to develop a method of using a large-area ionization chamber to compare the measured dosearea product to that calculated by a treatment planning system. C) To gain further understanding of the dose-area product by supplementing the results with 2D high resolution film dosimetry.

149p runthenight04 02-02-2023 8 3   Download

Autophagy and DNA repair are two essential biological mechanisms that maintain cellular homeostasis. Impairment of these mechanisms was associated with several pathologies such as premature aging, neurodegenerative diseases, and cancer. Intrinsic or extrinsic stress stimuli (e.g., reactive oxygen species or ionizing radiation) cause DNA damage. As a biological stress response, autophagy is activated following insults that threaten DNA integrity.

18p thiencuuchu 27-11-2021 11 1   Download

An experimental analysis of the effect of gamma and X-ray irradiation with dose rate 0.25 -6mSv/h on low-density polyethylene (LDPE) and PMMA samples is presented. The focus of attention is on their DC conductivity as a dielectric of a capacitor.

10p tohitohi 19-05-2020 31 2   Download

Objectives: To assess the situation of radiation safety, health and illnesss of health workers exposed to ionizing radiation in Thai Nguyen in the year 2012; To analyze the association between radiation safety and health of health workers at health facilities using ionizing radiation in Thai Nguyen; To evaluate the efficacy of some interventions about ensuring radiation safety and health of health workers at health facilities using ionizing radiation in Thai Nguyen.

27p change01 05-05-2016 49 5   Download

As charge-neutral particles, neutrons can only interact via strong interactions and ionize via secondary reactions. Most neutron detectors consist of a material that converts neutrons into charged particles within a conventional radiation detector

33p giotletinh_hd2009 18-09-2013 46 5   Download

The promoter of the early growth response gene (Egr-1) has been described to be activated by ionizing radiation, and it seems to be clear that this process involves di€erent mitogen activated protein (MAP) kinases, dependent on the speci®c cell type examined. However, early steps leading to activation of the corresponding pathways and thus to overexpression of Egr-1 are not well understood.

10p research12 29-04-2013 45 2   Download

Ionizing radiation, oxidative stress and endogenous DNA-damage pro-cessing can result in a variety of single-strand breaks with modified 5¢ and⁄or 3¢ ends. These are thought to be one of the most persistent forms of DNA damage and may threaten cell survival. This study addresses the mechanism involved in recognition and processing of DNA strand breaks containing modified 3¢ ends.

11p dell39 27-03-2013 60 6   Download

Exposure of cells to ionizing radiation induces activation of multiple signal-ing pathways that play a critical role in controlling cell death. However, the basis for linkage between signaling pathways and the cell-death machin-ery in response to ionizing radiation remains unclear.

13p media19 06-03-2013 34 3   Download

The characteristics lines in X-ray spectra result from electronic transitions between inner atomic orbitals. The X-ray spectra for most heavy elements are much simpler than the UV/Vis spectra observed in ICP-OES, for example. (Only a few lines!!!) Big difference between X-ray and UVVis: The radiation is ionizing, and doesn’t just excite electrons to higher levels. Moseley’s law: Predicts the basic relationship of atom number and the frequency of the characteristic lines

24p qdung92ct 03-07-2012 79 16   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: Eight years of IMRT quality assurance with ionization chambers and film dosimetry: experience of the montpellier comprehensive cancer center...

11p toshiba10 14-10-2011 53 3   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: Ionizing radiation and inhibition of angiogenesis in a spontaneous mammary carcinoma and in a syngenic heterotopic allograft tumor model: a comparative study...

6p toshiba10 14-10-2011 41 4   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: MicroRNA expression profiles in human cancer cells after ionizing radiation...

5p toshiba10 14-10-2011 44 2   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: Two years experience with quality assurance protocol for patient related Rapid Arc treatment plan verification using a two dimensional ionization chamber array...

8p toshiba10 14-10-2011 47 4   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: The Akt-inhibitor Erufosine induces apoptotic cell death in prostate cancer cells and increases the short term effects of ionizing radiation...

12p toshiba10 14-10-2011 37 2   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: MicroRNA expression after ionizing radiation in human endothelial cells...

10p toshiba9 14-10-2011 44 2   Download

Examine the cause and effects of the release of an industrial cyanide/heavy metals impoundment into a major European river system. • Examine the heavy metals release from a tailings dam failure in Southwestern Spain. • Describe the science and toxicological impacts of ionizing radiation resulting from radionuclides.

10p nguyenvanquan037 07-01-2011 94 3   Download

Becoming less common. Poikiloderma is a term used to describe a patch of skin with (1) reticulated hypo- and hyperpigmentation, (2) wrinkling secondary to epidermal atrophy, and (3) telangiectasias. Poikiloderma does not imply a single disease entity—although becoming less common, it is seen in skin damaged by ionizing radiation as well as in patients with autoimmune connective tissue diseases, primarily dermatomyositis (DM), and rare genodermatoses (e.g., Kindler syndrome). In scleroderma, the dilated blood vessels have a unique configuration and are known as mat telangiectasias.

7p konheokonmummim 30-11-2010 88 6   Download

Cholestatic Conditions When the pattern of the liver tests suggests a cholestatic disorder, the next step is to determine whether it is intra- or extrahepatic cholestasis (Fig. 43-1). Distinguishing intrahepatic from extrahepatic cholestasis may be difficult. History, physical examination, and laboratory tests are often not helpful. The next appropriate test is an ultrasound. The ultrasound is inexpensive, does not expose the patient to ionizing radiation, and can detect dilation of the intra- and extrahepatic biliary tree with a high degree of sensitivity and specificity.

8p ongxaemnumber1 29-11-2010 66 3   Download