Final answer:
An Ionization chamber is the type of personnel radiation monitor that provides an immediate reading. Thermoluminescent dosimeters (TLDs), Optically stimulated luminescence (OSL) monitors, and Film badges require processing and hence cannot offer instant dose readings.
Step-by-step explanation:
The type of personnel radiation monitor that can provide an immediate reading is an Ionization chamber. Devices such as Thermoluminescent dosimeters (TLDs) and Optically stimulated luminescence (OSL) monitors do not provide instant readings; they require processing in a laboratory setting to measure the dose received. However, an Ionization chamber, also known as a pocket dosimeter, can give an immediate dose reading. Film badges, like TLDs and OSLs, also cannot provide immediate readings as they require developing the film to measure exposure.
Hence, the correct answer to which type of personnel radiation monitor can provide an immediate reading is D. Ionization chamber.