Comparison%20between%20neutron%20data%20from%20HEND%20and%20gamma-ray%20data%20from%20GRS

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Comparison between neutron data from HEND and
gamma-ray data from GRS

• S. Charyshnikov, M. Litvak, V. Grinkov,
• A. Kozyrev, A. Sanin
• I. Mitrofanov, V. Tretyakov
• Institute for Space Research

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SCHEME

• Correlation between epithermal and fast neutron
  flux and intensity of induced activity lines
  (Mg-1369, Ti-1381) as markers of neutron flux.
• Correlation between epithermal and fast neutron
  flux and natural radioactivity lines (K-1461).
• Correlation between epithermal and fast neutron
  flux and inelastic scatter gamma-ray lines
  (Si-1779).

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SOURCE DATA

• Take GRS spectra of surface of Mars for pixels
  10x10 degree for time period
• 08.06.2002 000000 UTC ? 09.02.2003 130000
  UTC

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SOURCE DATA

• Pick lines of Mg-1369, Ti-1381, K-1461, Si-1779
  out spectra.

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SOURCE DATA

• Subtract background from each selected line
• Calculate intensity of these lines

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SOURCE DATA

• Make epithermal and fast neutron flux maps for
  the same time
• interval
• 08.06.2002 000000 UTC ? 09.02.2003 130000
  UTC

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Make correlation between neutron flux data and
gamma-ray data
8
Make correlation between neutron flux data and
gamma-ray data
9
Make correlation between neutron flux data and
gamma-ray data
10
Make correlation between neutron flux data and
gamma-ray data
11
Make correlation between neutron flux data and
gamma-ray data
12
Make correlation between neutron flux data and
gamma-ray data
13
Make correlation between neutron flux data and
gamma-ray data
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Make correlation between neutron flux data and
gamma-ray data
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R E S U M E

1. Line Si-1779 has better correlation with flux of
   fast neutrons.
2. Line K-1461 has good correlation with flux of
   fast neutrons and has almost no correlation with
   flux of epithermal neutrons.
3. Lines Mg-1369 and Ti-1381 have good correlation
   with together fluxes of epithermal and fast
   neutrons, Mg-1369 correlate better with flux of
   fast neutrons, but Ti-1381 correlate better with
   flux of epithermal neutrons.