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Fast neutron film dosimeter

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1. A DOSIMETER HAVING THE COMBINATION OF MEANS FOR INDICATING SUBSTANTIALLY THE FULL RANGE ENERGY SPECTRUM OF FISSION NEUTRONS AND FOR MONITORING THE PRESENCE OF OTHER RADIATION, SAID COMBINATION COMPRISING A LIGHT WEIGHT MODERING PLATE FOR THERMALIZING THE FAST NEUTRONS OF SAID FULL RANGE ENERGY SPECTRUM, SAID PLATE HAVING A HYDROGEN ATOM CONTENT OF NO LESS THAN 4X10**22 ATOMS PER CUBIC CENTIMETER, MEANS FOR CONVERTING SUCH THERMALIZED NEUTRONS TO OTHER FORMS OF RADIATION AND FOR ABSORBING STILL OTHER FORMS OF RADIATION, SAID LAST MENTIONED MEANS COMPRISING A PLURALITY OF METAL FOILS ONE HAVING A CAPTURE CROSS-SECTION OF AT LEAST 50 BARNS AND ANOTHER BEING SUBSTANTIALLY TRANSPARENT TO NEUTRONS, MEANS FOR INDICATING THE EXTEND OF THE RADIOACTIVE FORMS EMANATING FROM THE CONVERTING MEANS, AND MEANS FOR HOLDING THE VARIOUS MEANS CLOSELY ADJACENT ONE TO THE OTHER.
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