- 32 - wis was not detected in breadfruit, arrowroot, or coconut milk at Rongelap or in the internal parts of Pandanus fruit from Nan Island, Bikini Atoll. Since the above samples represent the internal parts of plants and did not contain wi8s , although leaf samples from the same area did contain high levels of the isotope, it is probable that wi85 is not taken up in significant amounts by plants but occurs rather as surface contamination.