Both these techniques rely on uniformitarian assumptions and dating techniques.Furthermore, there are serious discrepancies between the microcrater data and the satellite data that remain unexplained, and that require the meteoritic dust influx rate to be higher today than in the past.When this is done, most current estimates of the meteoritic dust influx rate to the earth fall in the range of 10,000-20,000 tons per year, although some suggest this rate could still be as much as up to 100,000 tons per year.Apart from the same satellite measurements, with a focusing factor of two applied so as to take into account differences in size and gravity between the earth and moon, two main techniques for estimating the lunar meteoritic dust influx have been trace element analyses of lunar soils, and the measuring and counting of microcraters produced by impacting micrometeorites on rock surfaces exposed on the lunar surface.Carl, Purdue University, West Lafayette, Indiana, Biotechnology - Derived Drug Product Development; Regulatory Considerations in Approval of Follow - On Protein Drug Products Sudhir S.
Image is by MIBG scintigraphy, with radiation from radioiodine in the MIBG.Accumulation at the sides of the head is from salivary gland uptake of iodide. I derived radioactivity on Earth is man-made, an unwanted long-lived byproduct of early nuclear tests and nuclear fission accidents.All other iodine radioisotopes have half-lives less than 60 days, and four of these are used as tracers and therapeutic agents in medicine.Non-Purdue users, may purchase copies of theses and dissertations from Pro Quest or talk to your librarian about borrowing a copy through Interlibrary Loan.(Some titles may also be available free of charge in our Open Access Theses and Dissertations Series, so please check there first.) Access to abstracts is unrestricted.These are I (half-life 8 days) is one of the common radioactive fission-products of nuclear fission, and is thus produced inadvertently in very large amounts inside nuclear reactors.