Radiation Environment and Induced Activity Near the RHIC Internal Beam Dump Page: 5 of 15
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Table I
Danger Parameters for 500 MeV and 360 days irradiation
in units of mrad/hr per neutron/cm2sec.
Cooling time Marble Steel
1 hour 4.6 x 10-6 5.0 x 10-5
1 day 1.3 x 10-6 3.2 x 10-
10 days 4.2 x 10-' 1.8 x 10-
The geometry used for the evaluation of eqn (1) is sketched in Fig. 8 which shows
three points considered, each one 1 ft. from an irradiated object. The first two points in this
figure, P1 and P2, view the dump side wall where Z < 2.8m and Z > 2.8m respectively. For
both these points, the integral is calculated for both the outer marble surface and the closest
steel surface.9 The actual contribution at these points from the steel is reduced by the
shielding represented by the marble. Again assuming the typical photon to be 500 keV
obtains a reduction factor of e-'4.62 where t = 15 cm. for P1 and 10 cm. for P2. The third
point in Fig. 8 is 1 ft. from a crude approximation of the cryostat, namely a cylindrical
volume extending from R = 13.8 cm. to R = 39 cm. filled with Fe at 2% of the normal
density or 0.15 g/cm3. In this case the star density used for the cryostat contribution was
averaged over the entire cryostat volume and, as in the case of the dump, added to a
contribution from the outer 3 cm. of the yoke steel.
The results, which combines star density CASIM calculations in the regions described
with the values of I and D given above and a numerical evaluation of eqn. (1) are shown
in Table II below.
Table II
Induced Activity in mrem/hr at 1 ft. from Locations Indicated
Dump (Z < 2.8m) Dump (Z > 2.8m) Q4
Cooling time marble steel Total* I marble steel Total*
1 hour 6.0 9.5 6.4 6.6 25.8 9.6 0.9
1 day 1.7 6.1 1.9 1.9 16.5 3.8 0.6
10 days .55 3.4 .70 .60 9.3 1.7 0.3
* Total = marble + steel.e-'462 where t = 15 cm. or 10 cm.4
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Stevens, A. J. Radiation Environment and Induced Activity Near the RHIC Internal Beam Dump, report, November 12, 1992; United States. (https://digital.library.unt.edu/ark:/67531/metadc871738/m1/5/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.