In a recent discussion relating to environmental health, Mark D. Hollis (1) indicated that public health officials will be responslible for protecting the population against the harmful effects of ionizing radiation. Ionizing radiations result from the disintegration of unstable nuclei and are damaging to living tissue. The radiation may originate from an external source or from radioactive mat...

Certain materials "decay" at the atomic level over a period of time, giving off "radiation" in the form of energy or subatomic particles. This radiation can be harnessed and used for a variety of industrial applications. Some of the commonest of these which are used in New Zealand are listed below, although many others exist that are either only used to a small extent or used exclusively overseas.

INTRODUCTION In recent days, the words of clearance and clearance level are frequently used in the field of radioactive waste. This note is showing current Japanese situations on this issue and the discussion items. Clearance is defined as: removal of radioactive materials or radioactive objects within authorized practices from any further control by the Regulatory Authority. Clearance level is...