Photocathode - Study guides, Class notes & Summaries

Describe electromagnetic radiation - correct answer 1. Electron radiations are released as photons 2. Quantized harmonic waves travel at the speed of light 3. Electric and magnetic waves are perpendicular to each other 4. Transition between the states induced by electromagnetic radiation: M + hν → M* Describe the Wave nature of a beam of single-frequency electromagnetic radiation - correct answer 1. a plane-pola...

UH 60 APART STUFF EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS GRADED A+ What is Astigmatism? - Answer-irregular shaped cornea What is Hyperopia - Answer-close obj's not seen clearly What are the NVG Characteristics and Operation of the (AN/AVS-6) - Answer-- began being utilized by the Army in 1969 - intensifies light by times / amplification is 25,000 times - 30 minutes remaining when "low voltage" light on helmet illuminates - best visual acuity is 20/40 - designed to opera...

California Fluoroscopy Test Exam Questions With Accurate Answers. An image intensifiers photocathode causes ___ to be given off in direct proportion to the intensity of the fluorescent light: a. remnant radiation b. electrons c. x-rays d. light photons - answerelectrons What fluoroscopic television system device decodes the video signal into a visible image? a. Vidicon camera b. Camera control unit c. Television monitor d. Electron gun - answerTelevision Monitor Which of the followi...

According to National Council on Radiation Protection and Measurement (NCRP) guidelines, a medical xray tube must include aluminum equivalent filtration equal to a minimum of: - 2.5 mm Which two guidelines are accepted means of controlling infection in the imaging department? 1. Never transport an isolation patient into the radiology department 2. Wash hands before and after every patient 3. Wear gloves when emptying soiled linen 4. Recap dirty needles 5. Wear head covering when working w...

radt 109 Questions And Correct Answers The image intensifier's input phosphor differs from the output phosphor in that the input phosphor - Answer -is much larger than the output phosphor fluoroscopic equipment features designed to eliminate unnecessary radiation exposure to patients and/or personnel include - Answer -1. protective curtains 2. filtration 3. collimation The brightness level of the fluoroscopic image can vary with changes in - Answer -amperage 2. kilovolt 3. patient thic...

______ ______ provides a brighter image for viewing. Answer - Image Intensification Using conventional fluoroscopy, the exit radiation interacts with the ______ ______ which converts the radiation to light. Answer - Input phosphor The input phosphor is a light emitting material such as ______ ______. Answer - Cesium Iodide The light photons are converted to electrons by the ______. Answer - Photocathode The process of converting light to electrons is called ______. Answer - Photo emi...

California Fluoroscopy Test (2024) Questions Bank With 100% Complete Answers!!

X-rays: Typical diagnostic wavelength and photon energy range. - Answer-100ev-200 keV min. wavelength 6pm-12nm Structure and function of the x-ray tube. - Answer-A vacuum tube with an anode and a cathode. The cathode is heated and electrons are emitted, they are accelerated by a voltage difference in the tube. When the "brake" against the material of the anode, they release their high kinetic energy in the form of an x-ray. *x-ray tubes are of very low efficiency, most of the radiation i...

An image that demonstrates low contrast can be caused from: 1. High mAs 2. Low kVp 3. Insufficient beam restriction correct answer: 3 only Which of the following interactions with matter reduce contrast in an x-ray image? correct answer: compton scattering What type of fracture is illustrated below? (femur bone sticking out of skin) correct answer: compound fx From anatomical position, pronating the hand will result in the palm facing ____ correct answer: posteriorly With all oth...

Fluoroscopy mA range is Answer 0.5-5.0 During fluoroscopy the SOD cannot be less than how many inches on a mobile unit Answer 12 The input screen absorbs ______________ and emits _______________ Answer X-ray photons, light photons Electrostatic lenses are used to accelerate and focus Answer Electrons The photocathode absorbs ____________ and emits ______________ Answer Light photons, electrons The shape of the input screen helps control Answer Distortion The greater the voltage...