THE FORMER PRESENCE OF 60FE IN THE SOLAR SYSTEM HAS BEEN DETECTED IN METEORITES. HOWEVER IN ORDER TO USE THE 60FE-60NI SYSTEM TO ADDRESS FUNDAMENTAL QUESTIONS ABOUT THE ASTROPHYSICAL CONDITIONS AND CHRONOLOGY OF THE SOLAR SYSTEM S FORMATION THE INITIAL 60FE /56FE RATIO OF THE SOLAR SYSTEM MUST BE CONSTRAINED. PROGRESS TOWARD CONSTRAINING THE INITIAL ABUNDANCE OF 60FE IN THE SOLAR SYSTEM HAS BEEN HINDERED BY DISCREPANCIES BETWEEN IN SITU AND BULK ANALYSES AND LIKELY STEM FROM LATE-STAGE OPEN-SYSTEM FE-NI MOBILIZATION. THE (60FE/56FE)SS RATIOS INFERRED FROM BULK CHONDRULE ANALYSES ARE ALL CONSISTENT WITH<3 10-8. AN INITIAL RATIO AT THIS LEVEL IS MORE CONSISTENT WITH 60FE BEING INHERITED FROM THE GALACTIC BACKGROUND DURING THE SUN S FORMATION. IN SITU ANALYSES OF CHONDRULES OFTEN INFER INITIAL SOLAR SYSTEM RATIOS THAT ARE AN ORDER OF MAGNITUDE HIGHER THAN ESTIMATES BASED ON BULK DATA. TELUS ET AL. (2017) INFER AN (60FE/56FE)SS BETWEEN 5 10-8 AND 3 10-7 BASED ON 60NI EXCESSES OF 20 TO 70 IN CHONDRULES FROM UNEQUILIBRATED ORDINARY CHONDRITES. HOWEVER ISOCHRONS FOR CHONDRULES THAT HAVE RESOLVED EXCESSES IN 60NI ARE OFTEN SIGNIFICANTLY DISTURBED BASED ON THE POOR CORRELATION BETWEEN EXCESS 60NI AND THE FE/NI RATIOS. SYNCHROTRON X-RAY FLUORESCENCE MAPPING OF UNEQUILIBRATED ORDINARY CHONDRITES CHONDRULES SHOWS EVIDENCE FOR EXTENSIVE OPEN-SYSTEM FE-NI REDISTRIBUTION BETWEEN CHONDRULES AND THE SURROUNDING MATRIX MATERIAL (TELUS ET AL. 2016) PROVIDING AN EXPLANATION FOR THE POORLY CORRELATED INTERNAL ISOCHRONS AND THE DISCREPANCIES BETWEEN IN SITU AND BULK FE-NI DATA. TO BETTER UNDERSTAND THE 60FE-60NI SYSTEMATICS IN CHONDRULES AND TO CONSTRAIN THE INITIAL ABUNDANCE OF 60FE IN THE SOLAR SYSTEM WE WILL CARRY OUT COORDINATED IN SITU AND BULK FE-NI ANALYSES IN CHONDRULES FROM VARIOUS CHONDRITES. THIS STUDY IS DIVIDED INTO 5 PARTS: 1.) WE WILL FIRST THOROUGHLY CHARACTERIZE CHONDRULES FROM VARIOUS CHONDRITES USING SYNCHROTRON X-RAY FLUORESCENCE PRIOR TO ISOTOPE ANALYSES. 2.) WE WILL SYNTHESIZE MATRIX-MATCHED STANDARDS. 3.) WE WILL CARRY OUT IN SITU FE-NI SECONDARY ION MASS SPECTROMETRY USING THE NEW HYPERION DUOPLASMATRON SOURCE ON A LARGE GEOMETRY SIMS WHICH MAKES IT POSSIBLE TO MEASURE NI ISOTOPES IN SITU TO HIGHER PRECISION AND SPATIAL SCALES THAN BEFORE ALLOWING US TO TARGET AREAS IN BETWEEN FE-NI ALTERATION VEINS. 4.) A SUBSET OF SAMPLES WILL BE ANALYZED FOR IN SITU FE-NI ISOTOPES USING RESONANCE IONIZATION MASS SPECTROMETRY. THIS TECHNIQUE PROVIDES HIGHER NI YIELDS AND LITTLE TO NO INTERFERENCES. 5.) A SUBSET OF SAMPLES WILL BE ANALYZED FOR HIGH PRECISION BULK FE-NI ANALYSES USING ICPMS. COMBINING DETAILED 3-DIMENSIONAL SYNCHROTRON X-RAY MAPPING OF THE FE-NI DISTRIBUTION IN CHONDRULES WITH COORDINATED IN SITU AND BULK ISOTOPE ANALYSES IS THE MOST EFFECTIVE WAY TO FINALLY CONSTRAIN THE INITIAL 60FE/56FE RATIO OF THE SOLAR SYSTEM. THIS STUDY HAS BROAD IMPLICATIONS FOR THE STELLAR SOURCE OF SHORT-LIVED RADIONUCLIDES THE CONDITIONS OF THE SOLAR SYSTEM S FORMATION AND THE CHRONOLOGY OF EARLY SOLAR SYSTEM PROCESSES. IT IS RELEVANT TOWARDS NASA EMERGING WORLDS GOAL TO ADDRESS FUNDAMENTAL QUESTIONS ABOUT HOW THE SOLAR SYSTEM FORMED AND EVOLVED. REFERENCES: TELUS M. HUSS G. R. OGLIORE R. C. NAGASHIMA K. HOWARD D. L. NEWVILLE M. G. AND TOMKINS A. G. (2016) MOBILITY OF IRON AND NICKEL AT LOW TEMPERATURES AND IMPLICATIONS FOR 60FE-60NI SYSTEMATICS OF CHONDRULES FROM UNEQUILIBRATED ORDINARY CHONDRITES. GEOCHIM. COSMOCHIM. ACTA 178 87-105. TELUS M. HUSS G. R. NAGASHIMA K. OGLIORE R. C. AND TACHIBANA S. (2017 IN REVIEW) IN SITU 60FE-60NI SYSTEMATICS OF CHONDRULES FROM UNEQUILIBRATED ORDINARY CHONDRITES