By Raymond L. Murray
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6. Calculate the speeds and energies of the individual alpha particles in the reaction ÌH + 3L1 —» 2*He, assuming that they separate along the line of proton motion. 016004. 7. 000549. Note: In reactions involving positrons it is necessary to use masses of nuclei rather than atoms. Explain. 5 Reaction Rates The chance of interaction of any two particles obviously depends on the nature of the force between them. The most familiar force is that of electrostatics, described by Coulomb's relation F ~ qiq2lr2, where the q's are the charges carried by the objects and r is the distance of separation of their centers.
Photon-electron scattering (Compton effect).
16 x 107 sec, i „ = 1 . 6 7 x l 0 8 s e c . 77. The rate of release of radiation by a radioisotope is dependent on the activity, A, which is the number of disintegrations per second. Since the decay constant λ is the chance of decay each second, then with N nuclei present, the activity is A =AN. Let us find the activity for a sample of Co-60 consisting of 1 microgram, IO16 atoms. 15 x 107 disintegrations per second (d/sec). A useful unit of activity is the curie (Ci), named for the French scientists who worked with radium.