RP Cram Notes Question

[alphazulu]

In the Activity Calculations section it mentions that if the distance is different than 1 foot you can divide 6CEN by the distance squared.  In the first example though where the distance is 3 feet, the denominator is 32 instead of 9.  In the second example the distance is now 5 feet but the denominator is 52 and not 25.  When I use the 9 and 25 I get the correct answer but I'm just curious where the other numbers come from? Thanks

[Rennhack]

That should be 3² (3 squared) and 5² (5 squared)... not 32 or 52.  For some reason your copy does not have the super script correct.  I assume it is kindle e-book?  How long ago did you get it, and what are you viewing it on?

[alphazulu]

Ahhh thanks.  Yes it is a kindle e-book, purchased three days ago and viewed on an i-phone with the kindle app.

[Rennhack]

Ahhh thanks.  Yes it is a kindle e-book, purchased three days ago and viewed on an i-phone with the kindle app.

Thank you for that information.  I'll go look at it again and see if its a source issue, or maybe an issue with that specific format.

[Rennhack]

I just looked, and It is super scripted correctly.  The issue is with font.  The "2" in the squared is smaller than the other numbers, but not by as much as you would expect.  I may be able to fix this if I change the font.

[alphazulu]

Sorry, another question for you or someone else who has written the NUF. In the cram notes Activity Calculations section it mentions that Cs-137 emits a .662 MeV gamma 85% of the time and the calculations reflect this.  However in the RP-4 section of the study guide calculations ignore the 85%.  Which formula should I be using when writing the NUF? Thanks!

[Rennhack]

Sorry, another question for you or someone else who has written the NUF. In the cram notes Activity Calculations section it mentions that Cs-137 emits a .662 MeV gamma 85% of the time and the calculations reflect this.  However in the RP-4 section of the study guide calculations ignore the 85%.  Which formula should I be using when writing the NUF? Thanks!

You are correct, In the 'official' NUF study guide, in the RP-4 section, on page 10, it talks about 6CEn, the 'n' is the 85%, and it uses a Cs-137 example without the 'n'.  It is wrong.  It is one of many mistakes in the 'official' study material.  Thank you for pointing this out.

[Rennhack]

I have been in the field for 20 year of the Navy, Power Plant operations, and as an HP.  With the exception of air sample calculations, I have never used the formulas in the field to calculate dose.  We have our meters with us and ALARA people, if they have done there job, we should never need these calculations.  Do we test for this knowledge for some sort of working screening?  Does it make you a better tech if you can pass controlled tests?

You are off topic.  If you want to rant about what should be test material, please start your own topic, or use one of the other 10 that already beat that horse to death.

[alphazulu]

Thank you Michael, I appreciate your quick response.

[Rennhack]

Thank you Michael, I appreciate your quick response.

That is one more reason that I need to get off my rear end and get the next edition of our study material finished.