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Gamma ray cross section - a measure of the probability that gamma ray interacts with matter. The total cross section of gamma ray interactions is composed of several independent processes: photoelectric effect, Compton scattering, electron-positron pair production in the nucleus field and electron-positron pair production in the electron field (triplet production).
Security printing. Security printing is the field of the printing industry that deals with the printing of items such as banknotes, cheques, passports, tamper-evident labels, security tapes, product authentication, stock certificates, postage stamps and identity cards. The main goal of security printing is to prevent forgery, tampering, or ...
The Partial Test Ban Treaty ( PTBT ), formally known as the 1963 Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water, prohibited all test detonations of nuclear weapons except for those conducted underground. It is also abbreviated as the Limited Test Ban Treaty ( LTBT) and Nuclear Test Ban Treaty ( NTBT ...
www .princegeorgescountymd .gov. Prince George's County (often shortened to PG County) [2] [3] is located in the U.S. state of Maryland bordering the eastern portion of Washington, D.C. As of the 2020 U.S. census, the population was 967,201, [5] making it the second-most populous county in Maryland, behind neighboring Montgomery County.
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January 20 – Donald Trump is sworn in as the 45th president of the United States, [27] and Mike Pence is sworn in as the 48th vice president. January 21 – 2.9 million people attend the Women's March in opposition to the inauguration of Donald Trump, making it the single biggest protest in U.S. history. [28] January 23.
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