Which of the following statements is true regarding film badges?

Film badges are indeed affected by environmental conditions, which is an important consideration in radiation monitoring. The materials used in these badges can change in response to factors like temperature, humidity, and exposure to light. For instance, if a film badge is exposed to high humidity or extreme temperatures, it could either fog the film or create a reaction that might lead to inaccurate dosimetry readings. Therefore, proper care and storage are essential to ensure the accuracy of the readings obtained from film badges.

On the other hand, the requirement for calibration of film badges is based on the type of radiation and the specific setup used, which makes the idea that they require no calibration inaccurate. Additionally, while it's possible to store and keep film badges for a limited time, they are typically considered single-use devices for billing and accuracy reasons, which contrasts with statements suggesting they can be reused. Lastly, in high radiation areas, film badges actually can provide reliable readings, but they may not be as sensitive or accurate as other dosimetry devices like thermoluminescent dosimeters (TLDs) when it comes to very high doses.