Perey then attempted to determine the proportion of beta decay to alpha decay in actinium-227.

In 1939, Perey discovered the element francium by purifying samples of lanthanum that contained actinium.

Eka-caesium was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris, France when she purified a sample of actinium-227 which had been reported to have a decay energy of 220 keV.

Perey, however, continuously criticized Hulubei's work until she was credited as the sole discoverer of element 87.

However, Perey noticed decay particles with an energy level below 80 keV.

Perey thought this decay activity might have been caused by a previously unidentified decay product, one which was separated during purification, but emerged again out of the pure actinium-227.

The new product exhibited chemical properties of an alkali metal ( such as coprecipitating with caesium salts ), which led Perey to believe that it was element 87, caused by the alpha decay of actinium-227.

Perey named the new isotope actinium-K ( now referred to as francium-223 ) and in 1946, she proposed the name catium for her newly discovered element, as she believed it to be the most electropositive cation of the elements.

* 1909 – Marguerite Perey, French physicist ( d. 1975 )

Marguerite Catherine Perey ( 19 October 1909 – 13 May 1975 ) was a French physicist.

Perey died of cancer in 1975.

The first woman admitted as a correspondent member was a student of Curie's, Marguerite Perey, in 1962.

One was published in 1855 by M. du Vigan ; the other was owned by the Comte de Coutades, who permitted Lucien Perey to give long extracts in his work on Président Hénault ( Paris, 1893 ).

Organ was recruited to the Greens by Elizabeth Perey, a former Tasmanian Greens council candidate, several months before his election in 2002.

She retreated by leaving the room when we suggested that our meeting might well terminate right then and there.

Knowing the antipathy that existed in Louisiana against increasing the number of free Negroes, Giffen suggested that Palfrey bring them to Boston at once, and then send them on to Liberia.

As early as 1573, Thomas Digges had suggested that this theory should necessitate a parallactic shifting of the stars, and, consequently, if such stellar parallaxes existed, then the Copernican theory would receive additional confirmation.

While the British military historian Sir John Keegan suggested an ideal definition of battle as " something which happens between two armies leading to the moral then physical disintegration of one or the other of them ", the origins and outcomes of battles can rarely be summarized so neatly.

William Craig, then Stormont Home Affairs Minister, suggested that the west bank of Derry should be ceded to the Republic of Ireland.

The name " Pluto " was reportedly suggested by Venetia Burney, then an 11-year-old English school girl, who died in April 2009, having lived to see the reclassification of Pluto as a dwarf planet.

Rhyming slang is used, then described and a number of examples suggested as part of dialogue in one scene of the 1967 film To Sir With Love starring Sidney Poitier.

Raimund Schelcher ( 1891 – 1979 ) of the club then suggested that Mayr visit his classmate Erwin Stresemann on his way to Greifswald, where Mayr was to begin his medical studies.

Korzybski pointed out the circularity of many dictionary definitions, and suggested adoption of the convention, then recently introduced among mathematicians, of acknowledging some minimal ensemble of terms as necessarily ' undefined '; he chose ' structure ', ' order ', and ' relation '.

Archibald Scott Couper in 1858 and Joseph Loschmidt in 1861 suggested possible structures that contained multiple double bonds or multiple rings, but the study of aromatic compounds was in its earliest years, and too little evidence was then available to help chemists decide on any particular structure.

" Edwards suggested that the pyramid was entered by robbers after the end of the Old Kingdom and sealed and then reopened more than once until Strabo's door was added.

If the Gospel of Barnabas is seen as an attempted synthesis of elements from both Christianity and Islam, then 16th and 17th century parallels can be suggested in Morisco and anti-Trinitarian writings.

The director then suggested either Humphrey Bogart or Frank Sinatra tackle the part, but Jack Warner rejected both.

While performing in Macon, Georgia, having now changed their name to the Flames, a club promoter, Clint Brantley ( then agent of one of Brown's idols, Little Richard ), suggested the band add " Famous " in front of their name to draw more people to his club.

Few then were surprised when Major's Conservatives lost the 1 May 1997 general election to Tony Blair's " New Labour ", although the immense scale of the defeat was not as widely predicted: in 1987 and 1992 the Conservatives had polled better than had been suggested by the opinion polls, but in 1997 this was no longer the case.

When asked to recommend someone else, Davis suggested Robert E. Lee, then an army major in Baltimore ; López approached Lee, who also declined on the grounds of his duty.

He suggested that " we have to keep in mind the awesome pace of change and realise how little time is left to act, and then each community and nation must find the best use of the resources they have to sustain civilisation for as long as they can ".

Underlying the basis of the “ containment ” of Germany was the so-called “ X documents ” provided by Carl Friedrich Goerdeler over the course of the winter of 1938 – 39 which suggested that the German economy, under the strain of massive military spending was on the verge of collapse, and which led British policy-makers to the conclusion that if Hitler could be deterred from war and if his regime was “ contained ” long enough, then the German economy would collapse, and with it, presumably the Nazi regime.

Philip then attempted to intervene in the negotiations for Sibylla's second husband, and suggested one of his own retinue, but the native barons refused his suggestion.

Alexander Hamilton, then building up the army, suggested sending it into Virginia, on some " obvious pretext ".

According to investigative journalist Lucy Komisar, Mehmet Ali Ağca had worked with Abdullah Çatlı in the 1979 assassination, who " then reportedly helped organize Ağca's escape from an Istanbul military prison, and some have suggested Çatlı was even involved in the Pope's assassination attempt ".

Cardinal Wolsey, Henry's chief adviser, then resumed marriage negotiations with the French, and Henry suggested that Mary marry the Dauphin's father, King Francis I himself, who was eager for an alliance with England.

It has been suggested that the other ten names are those of the men chosen by lot to kill the others and then themselves, as recounted by Josephus. View facing east from Masada.

When the deal was reached a week earlier, Dixon strongly suggested to Rozelle that the announcement be delayed until then.

Back in the house a hoodlum named Red Buck, sore because Billy had been allowed to leave unscathed, jumped from a bunk and swore he was going after him to kill him right then.

But is that not like going to a chemistry laboratory and blindly pouring out liquids and powders from an array of bottles and then, after stirring, expecting a new wonder drug inevitably to result??

For, after leaving the Army in 1956, I spent five years in Graduate School first at Boston College and then at the University of Toronto.

But then, after the little operetta had been given its feeble amateur rendering, everyone insisted that it was too good to be lost forever, and that the Royal Academy of Music must now have the manuscript in order to give it the really first-rate performance it merited.

Going through the Imperial Gate in the wall, I entered the grounds of Topkapi Palace, home of the Sultans and nerve center of the vast Ottoman Empire, and walked along a road toward another gate in the distance, past the Church of St. Irene, completed by Constantine in 330 A.D. on my left, and then, just outside the second gate, I saw a spring with a tap in the wall on my right -- the Executioner's Spring, where he washed his hands and his sword after beheading his victims.

And then again perhaps the reason why he couldn't find time to do any of the things he had planned to do after retirement: reading, roaming, gardening, lying on his back and watching the clouds go by, was because he didn't want to do them.

North and south, east and west, back and forth he sailed in the land-locked bay, plowing furiously forward until land appeared, then turning to repeat the process, day after day, week after week.

`` Range delivery '' meant that the buyer, after examinin' the seller's ranch records and considerin' his rep'tation for truthfulness, paid for what the seller claimed to own, then rode out and tried to find it.

He found them near the carcass of a zebra that had been killed the night before, and he circled once, nose to the ground, hair shooting up along his back, as it did when he was after lion or bear, and then he lifted his head and bayed, and the pack joined in, all heads high, and Jones knew it was a hot trail.

Take the Via Di S. Agnese in Agone, next to the church and opposite the center of the square, then turn right after about two hundred yards to reach the beautiful Church of Santa Maria Della Pace.

His son watched until he got as far as the hall, almost out of sight, then hurried after.

Fiedler was then technical director of Hitler's super-secret `` Reichenberg project '', which remained unknown to the Allies until after the war.

Well, most of our fears may be unfounded, but after you discover that fact, you have something else to worry about: Why then do we have these fears??

And then I remembered a few years before after their return from a short trip to Rome I had heard her boast, over and over again, `` On the boat people liked me for myself ''.

Would he have to clean up after her every day, clean the kitchen, the bathroom, and get down on his knees and scrub the kitchen floor, then hang up her dresses, pick up her stockings, make the bed while she lay around??

Parnassos, which was then named after her.

alt = Map displaying a looping line with arrows indicating that water flows eastward in the far Southern ocean, angling north east of Australia, turning sough after passing Alaska, then crossing the mid-Pacific to flow north of Australia, continuing west below Africa, then turning northwest until reaching eastern Canada, then angling east to southern Europe, then finally turning south just below Greenland and flowing down the Americas ' eastern coast, and resuming its flow eastward to complete the circle

One of Alexander's radical associates manages to extract a confession from Alex after removing him from F. Alexander's home and then locks him in a flatblock near his former home.

This refusal to accept any renunciation of allegiance to the Crown led to conflict with the United States over impressment, and then led to further conflicts even during the War of 1812, when thirteen Irish American prisoners of war were executed as traitors after the Battle of Queenston Heights ; Winfield Scott urged American reprisal, but none was carried out.

It has been celebrated as The Emperor's Birthday from 1927 to 1988, then renamed as Greenery Day after Hirohito's death in 1989.

In game 19, Korchnoi succeeded in winning a long endgame, then notched a speedy victory after a blunder by Karpov two games later.