This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Which of the following is a device of radiation dose measurement? 
Select and explain. 
A. Storage phosphor plate, B. Ionization chamber, C. Coolidge tube, D. Charged couple devices
B: Ionization chamber
Answer: B: Ionization chamber 
Explanation: The ionization chamber is the simplest of all gas-filled radiation detectors, and is widely used for the detection and measurement of certain types of ionizing radiation; X-rays, gamma rays, and beta particles.