Wednesday 17 February 2010

General comments about Radioactivity and Atomic Physics Explained


Please use this post to add any comments or thoughts about Radioactivity and Atomic Physics Explained.

14 comments:

  1. The collimator in a gamma camera is the first part through which a gamma ray passes when entering the camera. The collimator is made of lead septa to prevent non-perpendicular gamma rays interacting with the crystal. This process allows for reduction of scattered gamma rays entering the camera and also provides a better mechanism for determining the position the gamma ray has entered the system from this is particularly relevant in multiple headed gamma cameras used for performing SPECT acquisitions.

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  2. I've been looking through to find anything onthe effect of a magnetic field on a,b,g. I couldn't find it. Did I miss it?

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  3. Hi Matt, sorry about that it's in Radioactivity and Atomic Physics Explained, Lesson 9 - Atoms 3: The Nucleus from screen 147. Hope this helps.

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  4. i find the range of alpha beta and gamma animation rather confusing- we teach that gamma travels very far (several metres) and that beta travels up to 2 metres

    the animation show both tailing off before a metre. Can anyone shed any light on this please?

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  5. Greetings Julian! Furry Elephant Rocks! I'm not a physics student but have recently become very curious about the subject.

    I have a question and I don't know who to ask so I'm posting here.... I hope you don't mind! I have heard it said casually that the mass defect when two protons are brought together is 0.07% of the mass of two unbound protons. I am curious what exactly those two protons become? Do they start as two protons then become one proton and one neutron? And the energy released, the "binding energy" which is the "mass defect" when converted to kg using Einstein's famous equation, is it this famous 0.07% that goes missing? Did I understand this correctly? And does anyone know what in the world this missing mass/energy is? Where in the universe does it go? And if protons are fuzzy balls of probability, then how are binding energies so predictable?

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  7. In the "electroscope discharging by ionization" clip, the electrode's leaves should be oppositely charged with respect to the plate.

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  8. This comment has been removed by the author.

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  9. In all IGCSE syllabus, the penetration affect of each of the different types of radiation is clear, but according to the demonstration on the penetration affect of Gamma radiation it suggests that the count rate returns to zero with 60cm or so of air.

    This is confusing am I using the simulation wrong?

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  10. I want a sandwich.

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  14. This is a brilliant explanation and animation. I've linked to it in my notes, but it is now blocked by chrome. I am happy to subscribe but are you likely to make these animations available in HTML5? If not would you mind if I screen shot your animation and added a link to it?

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