Which device can be used to measure electron beam dose distributions?

The use of film for measuring electron beam dose distributions is a well-established practice in dosimetry. Film allows for the visualization of dose distributions in a way that can be quantitatively analyzed. When exposed to radiation, the film undergoes a chemical change that correlates with the amount of radiation it receives. After developing the film, a dose distribution map can be created, which accurately represents the dose received by different areas of the irradiated volume.

This capability is critical in radiation therapy as it allows dosimetrists to validate treatment plans and ensure that the prescribed dose conforms to the target area while minimizing exposure to surrounding healthy tissues. The flexibility of film in various geometries and its sensitivity to different types of radiation make it an ideal choice for this purpose.

In contrast, the other devices listed do not serve this specific function. A thermometer measures temperature, which is unrelated to radiation dose. A weight scale measures mass, and an X-ray machine, while related to radiation, is not used for directly measuring dose distributions like film. Thus, film stands out as the correct choice for measuring electron beam dose distributions in clinical settings.