He crouched there in the dark, straining for the sound, wondering what it was. It almost sounded like a slow-motion tabulator.... _The geiger counter!_ His heart skipped and a cold sweat broke out on his skin. There was a counter on board to warn against stray radiation. Not that there would be any--the Cameron-Smith energy converters were shielded so thoroughly that not even a single stray particle could get through. _They were supposed to be, that is. Was it possible that the engineers could have slipped up?_ Pictures of the survivors of Hiroshima and Nagasaki, hideous with radiation keloids, flashed into his mind. A news story about radiation poisoning gibbered in the back of his imagination. _Tick-tick-tick-tick!_ Sterility.... He flipped the light switch and floated over to the counter readings on the instrument panel. The row of tiny lights flashed rapidly in succession and the counter added another digit. Stray radiation ... stray.... It came to him, then. For a moment he had forgotten that the counter was apt to read high, due to the increase in cosmic ray radiation once outside the atmosphere of the earth. He laughed weakly. What a thing to forget! Something snickered in the back of his mind. _Yeah, what a thing to forget! And how will you tell whether the counter is reading stray radiation from the converters or the increase in cosmic rays? The engineers never make mistakes, though. Never? Well, hardly ever!_ The question of adequate shielding of the converters haunted him continuously. * * * * * By the sixth day out, Whiteford had become accustomed to the life in the cabin. He took it easy getting about and kept up with the business of the ship. By splitting the "day" into segments, as on earth, he managed to keep up a fairly normal routine. Sixteen hours on duty and about eight for sleeping, although sleeping wasn't too easy. He was rarely physically tired and made the mistake of trying to force himself to sleep. By the sixth "evening" he had developed into a first rate insomniac. And by the sixth evening he was aware that the job of pilot was one of sheer boredom. It was dull routine with nothing to break the monotony but worry. There was no radio, no television, no telephone to shatter the silence. The first day or so he had whistled and sung to himself; now he hated the sound of his own voice. He floated disgustedly in the hammock. He had read the meters, he had listed the readings in the log book. He had noted the changes between consecutive readings. He had tested the air and noted the humidity; he had listed his own physiological reactions from acne to watering eyes. He had cleaned and loaded the automatic cameras. All of which took about one hour out of every twenty-four. He threaded his way over to the locker containing the books and games Burger had mentioned. Odd that he hadn't thought of it before.