The line of passengers was disappearing through a doorway. A woman ahead of Bart turned and said nervously, "We won't be put into cold-sleep right away, will we?"
He reassured her, remembering his inbound trip five years ago. "No, no. The ship won't go into warp-drive until we're well past Pluto. It will be several days, at least."
Beyond the doorway the lights dwindled, and a Mentorian interpreter took his dark glasses, saying, "Kindly remove your belt, shoes and other accessories of leather or metal before stepping into the decontamination chamber. They will be separately decontaminated and returned to you. Papers, please."
With a small twinge of fright, Bart surrendered them. Would the Mentorian ask why he was carrying two wallets? Inside the other one, he still had his Academy ID card which identified him as Bart Steele, and if the Mentorian looked through them to check, and found out he was carrying two sets of identity papers....
But the Mentorian merely dumped all his pocket paraphernalia, without looking at it, into a sack. "Just step through here."
Holding up his trousers with both hands, Bart stepped inside the indicated cubicle. It was filled with faint bluish light. Bart felt a strong tingling and a faint electrical smell, and along his forearms there was a slight prickling where the small hairs were all standing on end. He knew that the invisible R-rays were killing all the microorganisms in his body, so that no disease germ or stray fungus would be carried from planet to planet.
The bluish light died. Outside, the Mentorian gave him back his shoes and belt, handed him the paper sack of his belongings, and a paper cup full of greenish fluid.
"Drink this."
"What is it?"
The medic said patiently, "Remember, the R-rays killed all the microorganisms in your body, including the good ones—the antibodies that protect you against disease, and the small yeasts and bacteria that live in your intestines and help in the digestion of your food. So we have to replace those you need to stay healthy. See?"