Sökning: "radiation doses"

Visar resultat 16 - 20 av 189 avhandlingar innehållade orden radiation doses.

1. 16. Ethical Aspects of Radiation Risk Management

   Författare :Per Wikman-Svahn; John Cantwell; Carl F. Cranor; KTH; []
   Nyckelord :HUMANIORA; HUMANITIES; HUMANIORA; HUMANITIES; radiation protection; radiological protection; nuclear power; nuclear energy; social issues; ethical issues; ethics; risk; uncertainty; value judgments; precautionary principle; distributive issues; justice; limits; prioritarianism; responsibility; egalitarianism; black swan; black elephant; risk management;

   Sammanfattning : This thesis is based on the assumption that the intersection of moral philosophy and practical risk management is a rewarding area to study. In particular, the thesis assumes that concepts, ideas, and methods that are used in moral philosophy can be of great benefit for risk analysis, but also that practices in risk regulation provide a useful testing ground for moral philosophical theories. LÄS MER

3. 17. Dosimetry and radiation quality in fast-neutron radiation therapy : A study of radiation quality and basic dosimetric properties of fast-neutrons for external beam radiotherapy and problems associated with corrections of measured charged particle cross-sections

   Författare :Jonas Söderberg; Gudrun Alm Carlsson; Crister Ceberg; Linköpings universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Neutron; Dosimetry; Radiotherapy; Monte Carlo; Microdosimetry; Cross-section; RBE; LET; Energy-loss corrections; Radiological physics; Radiofysik;

   Sammanfattning : The dosimetric properties of fast-neutron beams with energies ≤80 MeV were explored using Monte Carlo techniques. Taking into account transport of all relevant types of released charged particles (electrons, protons, deuterons, tritons, 3He and α particles) pencil-beam dose distributions were derived and used to calculate absorbed dose distributions. LÄS MER

4. 18. Ultraviolet radiation and cornea

   Författare :Alexander Podskochy; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Cornea; UVR; keratocytes; apoptosis; Fas ligand; hyaluronan; biglycan; rabbit; wound healing.;

   Sammanfattning : Background: Acute exposure of the mammalian eye to UVR results in development of photokeratitis after a period of a few hours. Chronic exposure to UVR is associated with an increased risk of several corneal disorders, including pterygium, climatic droplet keratopathy, and climatic proteoglycan stromal keratopathy. LÄS MER

5. 19. Radiation doses to the gonads of patients in Swedish roentgen diagnostics : studies on magnitude and variation of the gonad doses together with dose reducing measures

   Författare :Lars-Eric Larsson; Stockholms högskola; []
   Nyckelord :;

   Sammanfattning : .... LÄS MER

7. 20. Biomarkers of ionising radiation relevant to carcinogenesis : Dose, dose rate and LET dependency of the responses

   Författare :Milagrosa López Riego; Andrzej Wojcik; Lovisa Lundholm; Alexandros G. Georgakilas; Stockholms universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Ionising radiation; low dose; low dose rate; linear energy transfer LET ; mixed beams; dose and dose rate effectiveness factor DDREF ; cancer; DNA damage response; biomarkers; molekylär biovetenskap; Molecular Bioscience;

   Sammanfattning : A better understanding of the relationship between ionising radiation (IR) dose, dose rate and radiation quality, and the risk of stochastic effects would improve risk extrapolation from atomic bomb survivors’ data. Owing to insufficient statistical power of epidemiological studies to detect excess incidence of cancer following low doses of IR delivered at low dose rates (LDLDR), as typically encountered in most common human exposure scenarios, radiobiological experiments are fundamental to describe the biological effectiveness of LDLDR and to define the underlying molecular mechanisms. LÄS MER