Photon - Samenvattingen, Aantekeningen en Examens

In order for an x-ray photon to be measured it must: 1. enter the detector chamber 2. be absorbed by the detector material 3. be converted to a measurable event correct answers 1,2,3 Which system component converts the projection attenuation data into the proper digital form for the array processor? correct answers analog-to-digital converter Which of the following is NOT a function of a PACS system? a. reconstruction of the image from the raw data b. long term data storage c. digita...

Attenuation: a. is radiation that emerges from the patient b. describes changes in the x-ray beam as it travels through the patient c. produces only scatter radiation d. occurs only at doses used in radiation therapy - Answer Describes changes in the x-ray beam as it travels through the patient Which photon-tissue interaction makes radiography possible because of its creation of image contrast? a. Compton b. Coherent c. Photoelectric d. Pair production - Answer Photoelectric...

Photoelectric effect correct answers -When light of a sufficiently high frequency (typically blue to ultraviolet light) is incident on a metal in a vacuum, the metal atoms emit electrons. -albert einsteins 1905 explanation of the photoelectric effect won him the nobel prize. -Electrons liberated from the metal produce a current. -light beams of greater intensity produce larger current in this way. -higher the intensity of the light beam, the greater the number of photons per unit t...

_____ 1. X-ray photon passed through atom unchanged; no interaction _____ 2. Coherent scatter _____ 3. Photoelectric effect _____ 4. Compton scatter _____ 5. Bremsstrahlung radiation _____ 6. Radioactivity A. Electrons stop suddenly as they hit the anode. B. Ionization takes place when the photon ejects an outer shell electron. This results in the loss of energy for the photon and a negative charged electron. The low energy photon changes direction. C. An unstable atom releases energy...

Bio Beyond Unit 6 Energy Challenge Photosynthesis Exam What is meant by the term wavelength? Select the best answer: - ANSWER Distance between two peaks Looking at the image to the right, which categories of light exist other than visible light? Select all that apply: - ANSWER Radio Infrared X-Rays Gamma Rays Which particular photons do you think contribute most to photosynthesis? - ANSWER blue photons What do you think is happening to the green ligh...

Summary of Electricity, Electronics and Photonics for BA3 Business Economics at the VUB.

A patient is to receive 55 Gy to a tumor in the mediastinum. In order to meet the acceptable dose limits for the spinal cord, you could: a. use high energy photon beams to decrease the entrance dose. b. block the spinal cord out of all treatment fields after 40 Gy is delivered. c. use a BID treatment technique to achieve greater repair time for the normal tissue cells. d. utilize a 3DCRT beam arrangement including oblique beam angles. - ANS d. utilize a 3DCRT beam arrangement inc...

Light correct answers Has both wavelike and particle-like properties Electromagnetic radiation correct answers Made up of electric and magnetic fields Shorter; higher correct answers The _____ the wavelength, the _____ the frequency. λv = c c → speed of light ν → frequency λ → wavelength correct answers Electromagnetic radiation equation Stream of particles correct answers Photons More correct answers Do short-wavelength photons carry more or less energy? E → ener...

The visible part of the electromagnetic spectrum can be divided into seven color bands: red, orange, yellow, green, blue, indigo, and violet (from long to short wavelength). A single photon of which of these colors has the greatest amount of energy? correct answers Violet Compared to visible radiation, does infrared radiation have longer or shorter wavelengths and higher or lower energy per photon? correct answers longer; lower Why are near-infrared telescopes located on mountaintops and u...

b Combination of photon energy & tissue atomic # results in the highest probability of PE effect a. Low photon energy and low atomic number b. Low photon energy and high atomic number c. High photon energy and low atomic number d. High photon energy and high atomic number d How does the filament transformer of the x-ray machine change the shape of electrical power? a. Step-up voltage and step down-current b. Step-down voltage and step down-current c. Step-up voltage and step-up c...