#OnThisDay in 1915, American physicist Robert Hofstadter was born!
Hofstadter was awarded half of the 1961 @NobelPrize in Physics for his contributions towards our understanding of electron scattering as well as the structure of protons and neutrons. #TIL #WorldCancerDay
He is also known for his accurate prediction of two types of meson, which are subatomic particles consisting of one quark and one antiquark: the omega-meson and the rho-meson.
Hofstadter contributed to the development of nuclear medicine, specifically the use of gamma-ray spectroscopy techniques such as positron emission tomography. These medical imaging techniques are used for the diagnosis and monitoring of cancer as well as neurological conditions.
Hofstadter created a thallium-activated sodium iodide gamma-ray detector, for which he filed a patent in 1948. This type of detector remains a popular tool for gamma-ray spectroscopy to this day.

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More from @iaeaorg

6 Feb
.#Germanium was discovered #OnThisDay 135 years ago!
Clemens Winkler came upon this chemical element in 1886 as he was analysing the composition of argyrodite, a rare mineral found at a silver mine in Germany. Image
He named his new discovery after the Latin word ‘Germania’, the namesake of Germany. Fifteen years before, Dmitri Mendeleev had predicted its existence based on the gap between silicon and tin, which he noted in his newly created Periodic Table of Elements.
Highly sensitive to ionizing radiation like gamma & #Xrays, Ge plays an imptt role in the IAEA. One of the tools our inspectors use to verify enrichment levels of uranium is a detector w/ Ge crystals. These, when cooled to -140°C, can detect gamma radiation released from uranium.
Read 4 tweets
4 Feb
Our #WCD2021 event on #COVID19's impact on global cancer services starts in 10 mins!
 
Join @rafaelmgrossi, @IAEANA's M.Abdel-Wahab, @iaeapact's @LisaSglobal, @gjmdhoop, @XavierSticker, @AzzeddineFarha1 & 🇮🇩's S.Gondhowiardjo.
 
📺bit.ly/36GkuqM Image
“This event is an opportunity to be reminded of where we are — we don’t stop for a single minute, and when it comes to cancer we can’t stop,” says @rafaelmgrossi, emphasizing the IAEA has been extremely active in supporting its Member States during the pandemic. #WorldCancerDay
#Radiotherapy has been an optimal treatment option during the #COVID19 pandemic for cancer patients b/c it doesn't compete for in-demand hospital resources such as intensive care unit beds & is amenable to treatments w/ shorter regimens of radiation.” — @IAEANA's May Abdel-Wahab
Read 8 tweets
29 Jan
Today we celebrate Mohammad Abdus Salam’s birthday! He was one of the most influential theoretical physicists of the 20th century and the first Pakistani Nobel laureate in science. #TIL
Salam’s doctoral thesis on theory in quantum fields earned him international fame for its comprehensive and fundamental exploration of quantum electrodynamics.
This fed into his work in the 1960s when he devised the electroweak theory on unifying two of the four known forces of nature: electromagnetic force and weak nuclear force.
He hypothesized that weak force was transmitted by carrier particles — charged W and neutral Z bosons.
Read 6 tweets

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