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초록

This study provided data that can be used to discriminate asbestiform and
non-asbestiform amphiboles contained in landscaping rocks in recreational parks. The
length and width of fibers being at least 5 m long and with a minimum aspect ratio
of 3 : 1, were measured using a Transmission Electron Microscope(TEM) and compared
to an reference sample of asbestos. In addition, airborne asbestos concentrations around
landscaping rocks in the parks were evaluated. The samples were thicker than 1 m
(average 1.2 m) while the Health and Safety Executive(HSE) reference sample averaged
0.3 m in width with 100% thinner than 1.0 m. The average aspect ratios were 7.3 for
the park samples and 37.6 for the HSE reference sample. Based on these distributions,
the amphibole fibers in the sampled landscape rocks were found to be thicker and had
lower aspect ratios than those of the reference sample. The airborne concentration was
below analytical sensitivity. The results of this study can co