Sökning: "low dose effects"

Visar resultat 1 - 5 av 428 avhandlingar innehållade orden low dose effects.

1. 1. Short and long-term effects of exposure to low dose and low dose rate of gamma radiation : using in vitro and in vivo models

   Författare :Traimate Sangsuwan; Siamak Haghdoost; Eva Forssell-Aronsson; Stockholms universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Low dose; Low dose rate; High dose rate; Ionizing radiation; Adaptive response; Senescence; Premature senescence; Oxidative stress; Drosophila embryo; Mutation; DNA repair; molekylär biovetenskap; Molecular Bioscience;

   Sammanfattning : Assessment of human health risks from exposure to ionizing radiation (IR) is mainly based on the extrapolation of results from epidemiological studies on populations exposed to relatively high doses and often at high dose rates (HDR). Risk estimates after exposure to low doses and in particular at low dose rates (LDR) remain controversial due to a lack of epidemiological evidence. LÄS MER

3. 2. Evaluation of absorbed dose and image quality in mammography

   Författare :Bengt Hemdal; Malmö Medicinsk strålningsfysik; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; optically stimulated luminescence; radioluminescence; in vivo dosimetry; dose reduction; dose protocol; average glandular dose; absorbed dose; Breast cancer; mammography; Monte Carlo; image quality; image quality criteria; contrast-detail phantom;

   Sammanfattning : Mammography refers to the X-ray examination of the human breast, and is considered the single most important diagnostic tool in the early detection of breast cancer, which is by far the most common cancer among women. There is good evidence from clinical trials, that mammographic screening can reduce the breast cancer mortality with about 30%. LÄS MER

4. 3. Neonatally induced permanent neurotoxic effects of pesticides : identification of a vulnerable period for low dose effects

   Författare :Jonas Ahlbom; Uppsala universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

   Sammanfattning : .... LÄS MER

5. 4. Single-Proton Irradiation of Living Cells - Development of New Tools for Low-Dose Radiation Research

   Författare :Natalia Arteaga; Kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; lithography; UVL; EBL; SeACell; human hepatoma cells HepG2 ; reactive oxygen species ROS ; bystander effect; SU-8; cell recognition; cell irradiation; Single-Ion Hit Facility; low-dose; Fysicumarkivet A:2010:Arteaga Marrero;

   Sammanfattning : A Single-Ion Hit Facility (SIHF) consists of a custom-build facility based in particle accelerators which offers irradiation controlling the number of delivered particles with a precise targeting localization. The irradiation spot can be confined down to the nanometre scale allowing the irradiation of subcellular compartments with a single particle. LÄS MER

7. 5. Neonatal Exposure to Low-Dose Ionizing Radiation in Mice : Developmental Neurotoxic Effects of Single and Fractionated Doses and Interaction with Nicotine

   Författare :Sonja Buratovic; Per Eriksson; Jack Valentin; Uppsala universitet; []
   Nyckelord :;

   Sammanfattning : This thesis aims to investigate the developmental neurotoxic effects of low-dose exposure to ionizing radiation, alone or together with nicotine, during a defined critical period of neonatal brain development in mice. Investigation of neurotoxic effects following fractionated or acute low-dose radiation, resembling the clinical situation during repeated CT scans or radiation delivered to non-target tissue during radiotherapy, and possible interaction effects with other agents, is of great importance for risk and safety evaluation. LÄS MER