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6.2 Producing the radioactive substance (elution)

In the radiopharmacy Tc-99m is produced in a generator.

Mo-99, a product of the fission of uranium, is isolated from a nuclear reactor and absorbed on to an alumina column in the generator. When a saline solution is passed over the column, ion exchange results in the production of sodium pertechnetate. This can then be chemically manipulated to form a variety of compounds. The removal of the technetium by the passage of saline is known as elution.

Conveniently, the optimum interva
Author(s): The Open University

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The Effective Provision of Pre-School Education (EPPE) Project: Technical Paper 5 - Characteristics
This paper reports on interviews conducted with the managers of the EPPE pre-school centres. This interview was designed to provide information likely to help differentiate effectiveness in pre-school settings by contextualising information from observational profiles (reported in Technical Paper 6 in this series), other interviews with centre managers (reported in Technical Paper 3) and case studies (reported in Technical Paper 10). The paper reports on wide differences in provision across the
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Tourisme et lutte contre la pauvreté à Sainte-Lucie
Après une approche sociologique de la pauvreté et un diagnostic de l'état du tourisme à Sainte Lucie, Dominique Augier et Olivier Dehoorne analysent la tentative du gouvernement de Sainte Lucie afin de réduire la pauvreté par le dévelopement du tourisme.
Author(s): Augier, Dominique,Dehoorne, Olivier

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Document protégé par le droit d'auteur,Document protégé par le droit d'auteur

The enemy of my enemy is still my enemy: the polarized media landscape in Syria
Rima Marrouch, freelance journalist for Reuters, BBC, CBS, and Al Jazeera, gives a talk for the Reuters Seminar Series, Introduction by Richard Sambrook. Please note, that there are videos within this presentation which may sound distorted.
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Responsible Journalism and National Security in the Age of Big Data part 1
Chancellor of Oxford University, Lord Patten of Barnes, gives a short talk for the panel discussion on Journalism and National Security in the Age of Big Data
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Keep on learning

Study another free course

There are more than 800 courses on OpenLearn for you to choose from on a range of subjects. 

Find out more
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Keep on learning

Study another free course

There are more than 800 courses on OpenLearn for you to choose from on a range of subjects. 

Find out more
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Early Portuguese Slave trade
This short video introduces the way in which Portuguese exploration of Africa lead to slave trade.
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Charte graphique et mise en page (Module 2.4) (Vidéo)

MOOC “Création, publication et partage sur Internet” : cours en ligne délivré du 5 mai 2014 au 13 juillet 2014 sur la plateforme FUN-MOOC.

Semaine 2 : Structurer et mettre en forme un document : efficacité, cohérence et stabilité
Séquence 4 : Charte graphique et mise en page


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    US Navy's "warfighter game-changer" railgun set for sea tests
    Subscribe: http://smarturl.it/reuterssubscribe Apr. 21 - The U.S. Navy says it will test its prototype electromagnetic railgun aboard a naval vessel for the first time in 2016. The railgun can hurl a 23 lb. missile more than a hundred miles and is described by the Navy as "a true warfighter game-changer". Rob Muir reports. More Innovations: http://smarturl.it/Innovations Subscribe: http://smarturl.it/reuterssubscribe Reuters tells the world's stories like no one else. As the largest internati
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    7.2 Should I unsubscribe from mailing lists?

    Many spam messages have a line at the bottom offering to unsubscribe you from a mailing list, but you should be very wary of doing this. Quite often the senders of the spam will use the 'unsubscribe' option to verify that your email address is live. They may then sell your address to other people for use in spamming. So using the unsubscribe option can increase your spam rather than reduce it. Our advice is never to use the unsubscribe option unless the mail you receive is from a well-known,
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    Tributes for avalanche victims in Nepal
    Subscribe: http://smarturl.it/reuterssubscribe Family, friends and climbers gather in Kathmandu to pay respects to the sherpas who were killed in an avalanche on Mount Everest. Rough Cut. (No Reporter Narration). Subscribe: http://smarturl.it/reuterssubscribe More Breaking News: http://smarturl.it/BreakingNews Reuters tells the world's stories like no one else. As the largest international multimedia news provider, Reuters provides coverage around the globe and across topics including busines
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    Japanese Words of the Week with Risa for Beginners #24 - Food
    In this Beginner lesson, you’ll learn Japanese words about Food. Visit us at JapanesePod101.com, where you will find Japanese lesson notes and many more fantastic lessons and learning resources. Leave us a message while you are here! Learn Japanese with JapanesePod101.com! How would you react if someone put you on the spot with a Japanese [...]
    Author(s): JapanesePod101.com

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    3.2.1 Axes

    A graph is made using two different scales or axes, forming a right angle. The horizontal axis (x-axis) is used to represent the variable that changes in a consistent way, such as time, or in a way that you can control. The vertical axis (y-axis) is used to represent a variable that you measure but may not be able to control directly, such as a patient's temperature.

    Each axis should be carefully labelled to indicate what it represents. To plot a graph, you put a mark at the poin
    Author(s): The Open University

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    2.3 Negative feedback and stability

    If positive feedback results in change, then another mechanism must exist that creates stability. This is negative feedback.

    What stops water hyacinth from taking over the world? Clearly, it is the lack of tropical freshwater. As the number of water hyacinth reaches the limits of their water body, there is a sudden increase in the death rate as offspring compete for the ever decreasing levels of sunlight. The sudden overcrowding allows the establishment of a negative feed
    Author(s): The Open University

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    3.1 Searching for your ancestors

    In this section we consider searching for information about your ancestors. We cannot hope to cover all the techniques and information required to research genealogy, family history and local history; there is only time in this course to scratch the surface. Some of the activities here are open-ended; please do not spend too long on them. If the subject interests you, you can revisit it after the course finishes, making use of the genealogical resources in the Appendix.


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    El Uso de Scaners y Ploteadores Tridimensionales en Talleres de Dise?o Iniciales (The Use of Three-d
    The paper makes reference to the introduction of a new pedagogical strategy in the teaching of fundamental design in early design studios. The authors recognizes a relationship between the creative process and the media that supports the design process, and proposes the use of 3-dimensional scanners and plotters (rapid prototyping) for interfacing between the use of digital and analogue media. The paper suggests that in such learning environment the students will learn to design without the limi
    Author(s): Angulo, Antonieta H. and V?squez de Velasco, Guill

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    7 Course questions

    Now you have completed this course, try the following questions to test your understanding of this material.

    Question 19

    Like the Variscan Orogenic Belt, the Caledonian includes large granitic intrusions. Using
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    Vêtements et Accessoires Pour Femme (Accessories for Women)
    In this video the instructor recites various words that are associated with feminine accessories.  For beginning learners. The words appear at the bottom of the screen as they are recited.
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    1.5.7 Referencing

    We mentioned above that we need to reference sources to ensure we abide by copyright legislation. But there is another reason we need to give accurate references to items we use - so we can share it.

    Consider this scenario. A friend says they've just read an interesting article where Joshua Schachter, founder of Delicious has spoken about why it isn't a faceted search system, and you should read it. How would you go about finding it? Would you start looking in a news database, a search
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