What type of radiation detector is used primarily for measuring high levels of radiation?

The ionization chamber is the correct choice for measuring high levels of radiation due to its ability to provide accurate readings across a wide range of exposure levels. This type of detector works by measuring the ion pairs created when radiation passes through a gas within the chamber. The gas becomes ionized, and the resulting current is proportional to the amount of radiation that has interacted with the gas, allowing for precise quantification of high radiation levels.

Ionization chambers are particularly suited for applications where high radiation levels are encountered, such as in radiotherapy settings or during radiation safety assessments, because they can withstand and accurately measure these high exposures without saturating or damaging the detector. They can measure both photon and particle radiation effectively and are capable of providing both instantaneous and integrated dose measurements.

In contrast, a Geiger-Muller counter, while useful for detecting low to moderate levels of radiation, can become saturated and provide inaccurate readings in high radiation environments. Pocket dosimeters are more suited for personal dosimetry and measuring lower levels of radiation exposure over time, making them less ideal for high-range measurements. Thermoluminescent dosimeters (TLDs) are primarily used for measuring accumulated doses over longer periods and are not designed for immediate high radiation readings. Thus, the unique