| CPC G21G 4/02 (2013.01) [G01N 23/025 (2013.01); G01T 1/12 (2013.01); G21K 1/02 (2013.01); H05H 3/06 (2013.01)] | 43 Claims |

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1. A method comprising:
inserting a first target, from a set of at least two ion beam targets, into an ion beam accelerator that generates an accelerated ion beam;
activating said ion beam accelerator for a length of time such than an accelerated ion beam strikes said first target, thereby generating neutrons with a first monoenergetic neutron energy value;
removing said first target from said ion beam accelerator;
inserting a second target, from said set of at least two targets, into said ion beam accelerator; and
activating said ion beam accelerator for a length of time such than an ion beam strikes said second target, thereby generating neutrons with a second monoenergetic neutron energy value that is at least 100 kiloelectron volts (keV) different from said first monoenergetic neutron energy value;
directing the ion beam onto a collimator having a plurality of fingers, wherein a first portion of the ion beam strikes the collimator and a second portion of the ion beam passes through a central opening of the collimator; and
measuring a beam current of the first portion of the ion beam using the collimator.
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