Mock Exam Flashcards
What is the inverse square law a result of?
Divergence
What is the binding energy of a K shell electron in a tungsten atom?
69.5 keV
Why does the anode heel affect occur?
Because of x-ray absorption in the anode
Why is molybdenum used for the anode stem?
It is a poor thermal conductor
What is thermionic emission?
The heating of the filament that leads to the release of electrons
What occurs through the vacuum to the glass envelope?
Radiation
What occurs through the oil to the casing?
Convection
Describe how to undertake and light beam diaphragm test
Requires a test tool and IR
Use normal FID, collimate to the test tool
Lower exposure and expose
Check alignment meets requirements
What is FID?
Focus to image receptor distance
What is the function of a scintillator?
Converts x-rays to light
What is the function of a semiconductor chip?
Converts light into electrical signal
Describe fibre optic in reference to indirect DR
Transmits light to CCD chip and stops x-rays being produced
What would happen if only scatter radiation reached the IR
Image contrast would be low
What is the main reason to use a grid?
Improve image contrast
Describe Detective Quantum Efficiency (DQE)
A measure of the percentage of x-rays that hit the detector that are absorbed
What is an RPS and what is their role?
Radiation Protection Supervisor
Oversee QA, ensuring equipment and PPE is safe for use
Dealing with radiation incidents
Dose monitoring and TLDs
Risk assesment
What is a critical examination and what is its purpose?
An examination of x-ray equipment
Ensures all safety features and warning devices work correctly
What is equivalent dose?
The dose quantity representing the stochastic effects of radiation on the body
What are some qualities of a radiation detector?
Small size
Waterproof
Accurate
Unaffected by prescence of detector
What is the Dose area product?
Method of radiation dose monitoring
Radiation dose received by a patient
