devices to determine particle size distribution and radioactivity, and
micrometeorological techniques to determine aerosol fluxes.
simultaneous experiments were conducted:
Four
(1) a characterization of the
normal (background) suspended aerosols and the contributions from sea
spray off the windward beach leeward across the island, (2) a study of
resuspension of radionuclides from a field purposely laid bare by bulldozers as a worst-case candition, (3) a study of resuspension of radioactive particles by vehicular and foot traffic, and (4) a study of
personal inhalation exposure using small dosimeters carried by volunteers
during their daily routines.
Less complete studies similar to (1) and
(2) had been performed previously on Enjebi (Janet) and background
studies similar to (1) were performed later on Eneu.
The “normal or background" mass loading measured by
gravimetric methods for both atolls is approximately 55 we/m3,
The
Bikini experiments show that 34,¢/m? of this total is due to sea-salt
which is present across the entire island as a result of ocean, reef,
and wind actions.
The mass loading due to terrestrial origins is
therefore about 2lie/m>.
The highest
terrestria! mass loading
observed was 136.2/n immediately after bulldozing.
Concentrations o £
23942405, have been determined
for
collected aerosols for normal ground cover and conditions, i.e. ‘normal
conditions'', in coconut groves, for arezs being cleared by bulldozers
and being tilled, i.e. "high activity conditions," and for stabilized
bare soil,
i.e.,
the cleared areas after a few days weathering.
The
plutonium concentration in the collected aerosols changes relative
to
the plutonium surface soil concentration for the various situations.
es TREE,
We