Презентация Radiation Biophysics онлайн
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- Тип файла:ppt / pptx (powerpoint)
- Всего слайдов:111 слайдов
- Для класса:1,2,3,4,5,6,7,8,9,10,11
- Размер файла:2.74 MB
- Просмотров:88
- Скачиваний:1
- Автор:неизвестен
Слайды и текст к этой презентации:
№3 слайд
![Radiation Radiation](/documents_6/ca4e7e1c8931fad454b3a7d4b74a3caf/img2.jpg)
Содержание слайда: Radiation
Radiation biophysics is shortly ‘physics and chemistry of radiation and its effects on biological systems’
In physics, radiation is a process in which energetic particles or energetic waves travel through a vacuum, or through matter-containing media that are not required for their propagation.
Two energies of radiation are commonly differentiated by the way they interact with normal chemical matter: ionizing and non-ionizing radiation.
№4 слайд
![But, The word radiation is](/documents_6/ca4e7e1c8931fad454b3a7d4b74a3caf/img3.jpg)
Содержание слайда: But,
The word radiation is often informally used in reference to ionizing radiation (i.e., radiation having sufficient energy to ionize an atom),
Simply, the term radiation may correctly also refer to non-ionizing radiation (e.g., radio waves, heat or visible light).
Don’t forget: the particles or waves radiate (i.e., travel outward in all directions) from a source.
№8 слайд
![Some examples for radiation](/documents_6/ca4e7e1c8931fad454b3a7d4b74a3caf/img7.jpg)
Содержание слайда: Some examples for radiation source in hospitals
Radiology
X-Ray films: X-Ray attenuation
CT (=Computerized Tomography): X-Ray attenuation
Nuclear Medicine
PET (=Positron Emission Tomography): Pozitrons, Gamma rays
Radioactive substances which emit particles and Gamma rays
Radiation Oncology
X-Ray, Gamma Rays, radioactive substances
Cardiology, Gastroenterology, Urology etc.
Fluoroscopy: an imaging technique that uses X-rays to obtain real-time moving images of the internal structures of a patient through the use of a fluoroscope
Angiography: the technique that uses X-rays to obtain images of blood vessels
№10 слайд
![Electromagnetic EM Waves](/documents_6/ca4e7e1c8931fad454b3a7d4b74a3caf/img9.jpg)
Содержание слайда: Electromagnetic (EM) Waves
Electromagnetic waves are formed when there is a continuing process of an electric field developing a magnetic field and vice versa.
An electromagnetic wave has both, electric as well as magnetic components.
E, B and ‘propagation direction vector’ are perpendicular to each other.
№17 слайд
![Radioactive materials](/documents_6/ca4e7e1c8931fad454b3a7d4b74a3caf/img16.jpg)
Содержание слайда: Radioactive materials
Radioactive materials are substances which spontaneously emit various combinations of ionizing particles (alpha and beta, ..) and gamma rays of ionizing radiation to become more stable. This process is called radioactive decay. Radioisotopes are isotopes (same number of protons but different numbers of neutrons) which are radioactive.
№18 слайд
![Radioactive Decay Particle](/documents_6/ca4e7e1c8931fad454b3a7d4b74a3caf/img17.jpg)
Содержание слайда: Radioactive Decay
Particle
Alpha
Beta (B+, B-, Electron capture)
Series Decay: Radioactive parent decays to a "daughter" which may also be radioactive, therefore, is also simultaneously decaying. Resulting exposure is to the combination of both decays (and possibly additional daughters). Ex.: Radon
EM waves
X-Ray
Gamma Rays
№19 слайд
![QUANTIFICATION OF RADIATION](/documents_6/ca4e7e1c8931fad454b3a7d4b74a3caf/img18.jpg)
Содержание слайда: QUANTIFICATION OF RADIATION
Quantifying Radioactive Decay
Curie (Ci): Ci is a non-SI unit of radioactivity, named after Marie and Pierre Curie. It is defined as 1 Ci = 3.7 × 1010 decays per second.
Becquerel (Bq): One Bq is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. The Bq unit is therefore equivalent to an inverse second, s−1.
Quantifying Exposure and Dose
- Diagnostic purpose (roentgen, R)
- Treatment purpose (radiation absorbed dose , rad; gray)
- Protection (roentgen equivalent in man, rem; sievert)
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