Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 44 Page 45 Page 46 Page 47 Page 48 Page 49 Page 50 Page 51 Page 52 Page 53 Page 54 Page 55 Page 56 Page 57 Page 58 Page 59 Page 60 Page 61 Page 62 Page 63 Page 64 Page 65 Page 66 Page 67 Page 68 Page 69 Page 70 Page 71 Page 72 Page 73 Page 74 Page 75 Page 76 Page 77 Page 78 Page 79 Page 80 Page 81 Page 82 Page 83 Page 84 Page 85 Page 86 Page 87 Page 88 Page 89 Page 90 Page 91 Page 92 Page 93 Page 94 Page 95 Page 96 Page 97 Page 98 Page 99 Page 100 Page 101 Page 102 Page 103 Page 104 Page 105 Page 106 Page 107 Page 108 Page 109 Page 110 Page 111 Page 112 Page 113 Page 114 Page 115 Page 116 Page 117 Page 118 Page 119 Page 120 Page 121 Page 122 Page 123 Page 124Nuclear Science User Facilities 64 AlN survived 18 months of irradiation. — BernhardTittmann, Professor Figure 3. Example waveform from an elapsed time of 4 days. As part of this effort, PSU and collabo- rators have designed, fabricated, and tested piezoelectric and magnetostric- tive transducers that are optimized to perform in harsh, high flux environ- ments. Four piezoelectric transducers were fabricated with aluminum nitride (AlN), zinc oxide (ZnO), and bismuth titanate (BiT) as the active elements and two magnetostrictive transducers were fabricated with remendur and galfenol as the active elements. Accomplishments The irradiation was performed in the MIT Reactor for a period of 18 months. First and most importantly, the successful operation of the transducers are shown at integrated neutron fluence of approxi- mately 8.68 E+20 n/cm2 for n >1 MeV , temperatures in excess of 420°C, and a gamma fluence of 7.23 Gy/cm2 . Although the sensors could perform in such environments, it was not without some troubles. Some of the sensors had issues with electrical connection and mechanical coupling to the waveguide. This is demonstrated and explained in the context of the pulse‑echo signals. Overall, this is the longest exposure experiment conducted to the researchers’ knowledge on the chosen sensor materials and the first instrumented lead test for many of these materials, aside for aluminum nitride, which had previously been tested at PSU’s Brezeale Research reactor.The magnetostrictive transducers were moni- tored by Dr. Joshua Daw from INL and were found unaffected by the irradiation. Future Activities Additional funding has been sought from Bettis and obtained for post- irradiation examination of the ultrasonic transducers to obtain detailed measure- ments after the capsules have been dissassembled. Physical appearance, electrical impedance values, ultrasonic pulse-echo amplitudes, piezoelectric performance, and vibrational Q values will be obtained.