What are the two techniques of monitoring in radiation detection?

The correct choice identifies the two techniques of monitoring in radiation detection as direct and indirect.

Direct monitoring involves measuring the radiation levels by using instruments that are placed in the vicinity of the radiation source. This technique provides real-time data about the radiation present in the environment, allowing for immediate assessment and safety measures if necessary. Instruments such as Geiger-Müller counters or scintillation detectors exemplify direct monitoring as they give a direct reading of the radiation intensity in microsieverts per hour, for instance.

On the other hand, indirect monitoring refers to methods that measure the consequences or effects of radiation rather than the radiation itself. For instance, it can include assessing environmental samples (like air filters or soil samples) for contamination or analyzing the amount of radioactivity that has accumulated in a material over time. This technique may require chemical processes or laboratory analyses to determine the radiation level indirectly.

By understanding these two techniques, individuals engaged in CBRN reconnaissance can effectively assess and respond to potential radiation hazards, ensuring safety and informed decision-making in hazardous situations.