It could look like they didn't take the work seriously, but they really did because they're going to have to live with radioactivity their whole life.
Μοιάζει να μην παίρνουν  τη δουλειά σοβαρά αλλά το κάνουν επειδή θα χρειαστεί να ζήσουν  με τη ραδιενέργεια όλη τη ζωή τους.