[Crater-team] CRaTER LET spectra - Compton edges?

[Jody Wilson]

Hi CRaTER folks,

A "work in progress" panel that I'll include in my LPSC poster next week 
is a ratio of the whole-mission *mare* LET spectrum to the *highlands* 
LET spectrum.  The idea is that mare-rich elements should make positive 
spectral features in this ratio, while highlands-rich elements should 
produce dips in the ratio.




New since I last addressed this:

1) Wouter pointed out that gamma ray Compton edges should be more 
prominent in our data than the primary spectral lines, since CRaTER is 
not at all optimized to collect all of the energy from a given gamma ray 
photon.  So I'm only labeling the energies of the Compton edges now.

2) Andrew and Wouter have been searching for new methods of normalizing 
CRaTER data for making maps using combinations of singles rates and the 
"linger time" of LRO over the Moon.  Along the way Andrew discovered 
that the lunar map of the raw D4 singles rate looks kind of similar to 
the SEPI map (ditto the raw D6 singles rate map), which means that 
whatever is lighting up the highlands in the SEPI map is registering in 
D4 as well as D6.  Therefore in the above plot I've used the 
mare/highlands ratio from both D4 and D6 to improve the signal.

Notes:

Silicon and oxygen should make the brightest features due to their high 
overall abundance, but they're almost as abundant in the mare as the 
highlands, so they should basically cancel out in this ratio, and 
therefore I'm not labeling them.

-- 
Jody Wilson
Space Science Center
University of New Hampshire
---
Did you buy $ilver today?

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