A 100kg sample of Neptunium 234 (Np234) was accidentally released due to the gross negligence of Jerf, the worst nuclear engineer ever. A. Jerf plans to act as though nothing happened until 95% of the sample has decayed into other elements. How long will they have to keep waffling about pretending to do experiments? (hint: Wikipedia knows the half-life of (Np234)) B. After two weeks, Jarrison, Jerf's supervisor, notices Jerf has had a minor decrease in productivity and decides to confront Jerf. Realizing their jig is up, Jerf decides to eat as much as they can before Jarrison notices. Assuming they eat 5 kgs of Np 234, how much is left for Jarrison to find? C. Following this incident, Jarrison, along with the EPA, makes a graph detailing the amount of Np 234 in Jerf's lab. Draw this graph and label all important events. Do not include the amount of Np 234 that Jerf ingested, as a serendipitous genetic immunity to radiation Jerf inherited is the only reason they did not succumb to radiation poisoning years ago.

By READING the N vs t graph shown below, determine No & the half-life. N (x10¹ atoms) 120 90. 60. 30. 1 2 3 4 5 6 7 8 9 10 t(y) No = half-life = atoms

11. Radium-226, 226Ra, undergoes an alpha decay. The current sample of Radium-226 has an initial activity of 5.50 × 101º Bq. (a) Identify the daughter nucleus by name, nucleon number, atomic number and neutron number. (b) What is the decay constant? (c) How many radioactive nuclei were initially present in the sample? (d) How long will it take the sample to reach an activity of 5.00 x 1010 Bq?

1. Suppose that the average power consumption per year in a typical house is 300 W. What initial mass of 235 U would have to undergo fission to supply the electrical needs of such a house for a year? (Assume 200 MeV is released per fission. The Avogadro number is 6.02 × 102³) g 212 83 2. What is the energy released in this alpha decay reaction 32 Bi → 208Tl+He? (The atomic mass of 212 Bi is 81