Is it true or false that an EIC is not affected by external gamma radiation?

An Electret Ion Chamber (EIC) is a type of radon measurement device that is sensitive to ionizing radiation, including alpha particles emitted by radon and beta particles. However, it is also influenced by external gamma radiation. If an EIC is exposed to gamma radiation, this radiation can interact with the electret material, influencing the charge accumulation and potentially leading to inaccurate measurements of the radon level.

Therefore, the premise that an EIC is not affected by external gamma radiation is false. In practical applications, this means that when using an EIC for radon measurement, it is essential to understand the potential interference from not only radon itself but also from background gamma radiation to ensure accurate readings. This is particularly important in environments where gamma radiation levels may be elevated due to various sources.