Usefulness of floating radioluminography to tritiated samples

A new technique of radioluminography for 3H is shown, where by a spacer is inserted between the imaging plate and the radioactive sample in order to avoid radioactive contamination of the plate for repeated use. Also, elevation of the detection efficiency has been realized by improvement in the evacuation to minimize the absorption of 3H β-rays. The technique has been studied systematically for space distance (1 spacer thickness) and for air pressure. By evacuation, the detection sensitivity can be elevated to more than 15 times. This technique is highly suitable for microplate and filter samples.