PPT Slide
Proton flux: 3 1015 protons cm-2 s-1 Si old units
After 1 month of use the specific activity
of a heavy metal fixed target (3 ?) would be: = ? 3 1013 Bq g-1
And the total activity: = ? 5 1015 Bq 1.3 105 Ci
This value for the total activity would apply
to the band-saw target and to the Hg jet.
The dose rate at I m from a fixed target or the
compressed band saw (1 day decay time) = ? 100 Sv h 104 rem h-1
The total activity of volatile spallation
products (e.g. xenon, iodine) would be: = ? 1013 Bq 270 Ci
These would be captured in filters of the target enclosure vacuum system.
The extremely high induced activity levels may well provide the overriding reason for the use
of a mercury jet target. Mercury has no long half-life isotopes. So mercury could be distilled to remove most non-volatile spallation products. There is a wealth of experimental experience in the use of mercury - cite: G Bauer ESS.
Target and Production MUTAC 21 July 1999 cdj
Multiply by 9 for the dump