MEASUREMENTS OF SECONDARY LIGHT ION (PROTONS DEUTERONS TRITONS 3HE 4HE AND NEUTRONS) WERE CONDUCTED AT THE NASA SPACE RADIATION LABORATORY (NSRL) LOCATED IN BROOKHAVEN NATIONAL LABORATORY BETWEEN MARCH 2015 AND NOVEMBER 2017. THE MEASUREMENTS AND SUBSEQUENT ANALYSIS WAS SUPPORTED THROUGH NASA GRANT NNX17AI10A. A TOTAL OF 500 HOURS OF BEAM TIME WAS DEDICATED TO MEASURE LIGHT IONS PRODUCED BY A VARIETY OF BEAMS IN SEVERAL THICK POLYETHYLENE AND ALUMINUM TARGETS. THE EXPERIMENTS USED A TWO-TARGET CONFIGURATION TO MIMIC THE ENCLOSED SHIELDED ENVIRONMENT SIMULATED IN THE TRANSPORT MODEL CALCULATIONS. THE UPSTREAM AND DOWNSTREAM TARGETS WERE PLACED DIRECTLY ALONG THE CENTERLINE OF THE BEAM WITH THE DISTANCE BETWEEN THE CENTER OF THE UPSTREAM TARGET AND FRONT FACE OF THE DOWNSTREAM TARGET EQUAL TO 3.5 METERS. TWO TARGET MATERIALS WERE CHOSEN FOR THE MEASUREMENTS. ALUMINUM WAS USED AS ONE OF THE TARGET MATERIALS BECAUSE OF ITS COMMON USE IN SPACECRAFT AND POLYETHYLENE WAS USED TO REPRESENT THE CLASS OF HYDROGENOUS SHIELDING MATERIALS KNOWN FOR THEIR SUPERIOR CAPABILITIES TO REDUCE THE DOSE AND DOSE EQUIVALENT FROM GCR. THREE THICKNESSES WERE USED FOR PURE AL AND POLYETHYLENE UPSTREAM TARGETS (20 40 AND 60 G/CM2) AND TWO THICKNESSES WERE USED FOR COMBINED AL+POLYETHYLENE UPSTREAM TARGETS (20 AND 60 G/CM2). THE COMBINATION TARGET WAS CHOSEN TO SIMULATE AN ENVIRONMENT WITH AN ALUMINUM SHELL SURROUNDING MATERIALS INSIDE A SPACECRAFT SUCH AS WATER AND HUMANS. ONE THICKNESS (60 G/CM2) WAS USED FOR THE DOWNSTREAM TARGET WITH AN ALUMINUM DOWNSTREAM TARGET PAIRED WITH UPSTREAM ALUMINUM TARGETS AND A POLYETHYLENE DOWNSTREAM TARGET PAIRED WITH UPSTREAM POLYETHYLENE AND AL+POLYETHYLENE TARGETS. UPSTREAM TARGET THICKNESSES WERE CHOSEN TO INVESTIGATE THE RANGE OF THICKNESSES THAT ENCOMPASSED THE PREDICTED MINIMUM IN DOSE EQUIVALENT.