Answer
Beta particles are more likely to expose the film kept in a cardboard box.
Work Step by Step
We know that beta particles are more likely to penetrate the box; alpha particles will be blocked by a sheet of paper or air.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.