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2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott Downtown
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IAEA: Gunfire, drone attack at Ukraine’s Zaporizhzhia nuclear plant
The International Atomic Energy Agency team at Ukraine’s Zaporizhzhia nuclear power plant (ZNPP) reported hearing gunfire near the site this morning while a drone hit the plant’s training center.
In a news release today, IAEA director general Rafael Mariano Grossi said this is the third drone to target the training center, located just outside the site perimeter, so far this year. He called for an immediate end to drones being flown over or near nuclear facilities.
Randall R. Nason*
Nuclear Technology | Volume 67 | Number 2 | November 1984 | Pages 333-340
Technical Paper | Technique | doi.org/10.13182/NT84-A33521
Articles are hosted by Taylor and Francis Online.
The adjoint technique has been applied to accurately and economically predict the response of a portal monitor to photon emissions below ∼1.5 MeV, thus encompassing those sources generally of interest in nuclear safeguards applications. The adjoint source was defined as the product of the total attenuation coefficient and an experimentally determined efficiency factor, which accounts for the performance characteristics of the signal-processing system. The efficiency factor was determined from a combination of data obtained from a single NE-102 scintillator and results from corresponding three-dimensional forward MORSE calculations. A prototype walk-through portal was then fabricated with four identical NE-102 scintillators. Adjoint MORSE calculations were performed to obtain net count rates for various sources within this portal. These results were compared to experimental data and were found to agree to well within 10%. The photon response within the portal detection volume was then characterized by a series of MORSE calculations.