Friday, 8 May 2015

Basking in the glow...

This picture is taken with light generated by the most radioactive of the 10 surviving historical radium sources at the University of Glasgow, and now cared for by the Radiation Protection Service and the Hunterian museum.

It shows a sodium iodide crystal glowing under the influence of gamma rays from sample number 4, formerly stored in the "Soddy Box".   This sample is extremely radioactive, so the photograph was taken in the dark, using a mirror, with a thick wall of lead bricks between the sample and the photographer.

© University of Glasgow Photographic Unit


The photograph makes the glow look very bright, but this is due to a long exposure. In fact, the glow was only just visible to the naked eye.

Sunday, 22 December 2013

Isotope filming and Isotope Pecha Kucha in Glasgow

In early December, a TV crew were on campus in Glasgow, recording material for a short slot on the BBC's One Show, telling the story of Frederick Soddy, Margaret Todd, isotopes, and Soddy's early predictions of misuse of atomic energy. Although they had to rush off and film other news stories twice during recording, the filming was eventually completed on the 10th December, and an edited item sent off to the One Show HQ in London.

I alerted parents, relatives and Corporate Communications at the University. We tuned in to watch. However, no isotope slot appeared. Rumour has it that the item may appear in the New Year - we will see....

Meanwhile, Prof. Maggie Cusack and Dr. Cristina Persano, colleagues from the School of Geographic and Earth Sciences, organised, at incredibly short notice,  isotope Pecha Kuch event on the 18th December. I think this may have bee nthe first such pure science Pecha Kucha held in Glasgow. A star-studded lineup included TV's Professor Iain Stewart (who cheated, by giving an excellent, but non-isotope presentation on outrage and information in public perceptions of science). A large turnout enjoyed 10 very varied Pechas (or should it be Kuchas?) covering a wide range of chemical, medical, geological and environmental uses of isotopes....


Wednesday, 11 December 2013

Frederick Soddy on TV?

An outside broadcast team from the BBC have been recording material for a possible slot on the BBC's early evening "One Show". They've been looking at Soddy's life and work, and at some of the radioactive and non-radioactive materials relating to his work here in Glasgow.

The recording has not gone smoothly, having been interrupted first by developments in the Clutha bar helicopter crash, and then by high winds and damage to buildings.

However, yesterday, we managed to get all the filming done. If editing goes as planned, there should be an item on the One Show, at 7pm tomorrow night (12th December).

Amazing Frederick Soddy fact:

He was the first scientist of the atomic age to foresee the weapons potential. In a scientific article with Ernest Rutherford,  published in 1903 the phrase "atomic energy" had been used for the first time.(Rutherford,E. and Soddy,F. 1903, Radioactive Change. Philosophical Magazine series 6, No. 5, p 576-591). To the end of his life, Rutherford never believed that anything would come of "atomic energy", but Soddy saw at once the temptation that this might pose as the basis for new and terrible weapons, as well as for peaceful uses.

I n January 1904, he gave a speech to the Corps of Royal Engineers, at Chatham, which included this:

"It is possible that all heavy matter possesses latent and bound up with the structure of the atom, a similar quantitiy of energy to that possessed by radium. It it could be tapped and controlled, what an agent it would be in shaping the world's destiny! The man who put his hand on the lever... would possess a weapon by which he could destroy the earth if he chose."

Soddy's awareness, not just of the energy involved in nuclear processes, but of the likelihood of military applications was remarkable. This became a recurring theme in Soddy's writing, and was one of the main factors responsible for his giving up research in radiochemistry, and devoting his later academic life to economics, social policy, and the role of science in decision-making.

 HG Wells took on board Soddy's ideas, and in 1914, before the First World War, he published a novel "The World Set Free" which is dedicated to Soddy's ideas, and in which the phrase "atomic bomb" first appears (on page 96).  These bombs, dropped from biplanes, can destroy whole cities, and lead to a catastrophic global war, before mankind chooses peace, and a new era of atomic-powered prosperity and wealth.




















This book helped create the actual atomic bomb. Leo Szilard read Wells' book in 1932,  had the insight that a nuclear chain reaction could be used to create such a weapon, and patented the idea in 1934. With Einstein and others, he was part of the group which secured US government funding for the Manhattan Project. Soddy's ideas, and Wells novel thus had a direct link to the creation, and use of nuclear weapons.


Having helped create this new world, Soddy was also probably the first nuclear objector, abandoning his reearch when at the height of his powers. In doing so, he attracted ridicule, and wrote himself out of much of the history of the atomic  age which was written later in the century. Perhaps now it is time to look again at his short, but amazing contribution to birth of our modern scientific world view,  in Montreal, London and Glasgow at the start of the 20th century.



Wednesday, 4 December 2013

Happy Isotope Day!

Today is the birthday of the word "isotope", and we are celebrating here in Glasgow. Joining us, are several members of the Soddy family, from as far afield as Canada. Here they are in the Hunterian Museum with Frederick Soddy's "biscuit tin electroscope" and the famous "Soddy Box", the mock-medieval treasure chest built in the 1950s to house his radioactive samples.

NB The radioactive samples are no longer kept in the box - empty,  it's perfectly safe.

Several generations of Soddys in the Hunterian




Our new Science Showcase space will be opened tonight, with the initial show:

Born in Glasgow: 100 Years of Isotope Science

running until the end of March. We will be having a regular series of talks, demonstrations and other activites by isotope scientists and students in this space during this period. Wtach this space!

Tuesday, 3 December 2013

Soddyite but not Soddyium

Frederick Soddy is perhaps an obvious omission from the list of radiochemistry pioneers commemorated in the names of elements. We have curium rutherfordium, hahnium, seaborgium and meitnerium, and among physicists, bohrium, einsteinium, roentgenium, and fermium.

However, if you pause for a moment and imagine what the name might sound like:

soddyium

It sounds very like the well known element with atomic number 11.


However, Soddy has been commemorated in the mineralogical world. The bright yellow uranium silicate mineral species soddyite is named after him.  The original description of the species by Schoep  in 1922 uses the form "soddite", but the spelling "soddyite" is now universally used.

Yellow crystals of soddyite from Shinkolobwe, Zaire. Hunterian museum specimen M11678



Saturday, 30 November 2013

Ghosts of radioactivity past

Frederick Soddy's radioactive samples are no longer kept within the Soddy Box, which was built to house them in the 1950s.

The box, minus its radioactive contents, now lives in the Hunterian Museum at the University of Glasgow.

However, although the box is non-radioactive (or at least, no more radioactive than any normal material), it does bear witness to its former radioactive occupants.

Within the wooden, lead-lined chest, the samples were kept in glass jars.


The jars are now empty. However, they carry the scars from their former, intensely radioactive contents:



Sample 1 was effectively non-radioactive, and the jar looks like a normal glass sample jar. However, other jars, such as that containing sample 3, have developed a distinct smoky tint. Aluminosilicate materials exposed to ionising radaiation often develop smokiness (this is the cause of the colour in the quartz gemstone "cairngorm").

The intensity of the smokiness is a record of the how much radiation the glass has been exposed to.

Open the box!!

What do Frederick Soddy's radioactive materials from the first decade of the 20th century look like?


The samples are all in small sealed glass tubes containing small quantities of powders, or in one case, a metal tube. The maximum dose the samples deliver  varies from insignificant (Sample 1, labelled actinium), to 29 millisieverts per hour (No 4, encased in lead). Many of the glass tubes are smoky, violet or purple, but this is due to radiation damage to the glass - the actual contents are pure white.


The most significant sample may well be No 6, which is labelled "Mesothorium" in Soddy's own hand. Soddy's work which lead to his concept of isotopes involved mixing radium (Marie Curie's 226Ra derived from the uranium decay series) with barium salts, and "mesothorium" (now known as 228Ra derived from the thorium decay series) and trying to separate these mixtures by chemical means. Others had also tried this, but Soddy decided that the failure to separate them was not due to inadequate chemical techniques, but rather because mesothorium and radium were the same chemical element, occupying the same place in the periodic table. This insight, and the word isotope, were pubished in his letter to Nature on 4th December 2013.

It is almost certain that this is one of the samples Soddy used in developing this key concept.