G. Fehrenbacher1, A. Fertman2, F. Gutermuth1, E. Kozlova1, T. Radon1
Induced radioactivity in the target and in structures of heavy ion accelerators 1GSI
Darmstadt Germany, 2ITEP Moscow Russia
Contens • Activation experiment with Argon beam – 500 MeV/u – 800 MeV/u
• Comparison with FLUKA • Calculation of remanent dose in the target area of the present FRS
Targets for the irradiation with Argon beam
Ionization chamber Al 100 µm 50 mm Ar Beam
Target 600 mm
Vacuum
Air
Secondary “front“ surface electron (foil 0) monitor
Cu target set of disks mm:
1, 7, 1, 7, 1, 5, 1, 1, 1, 5, 1 , 5, 1, 5, 1, 3, 1 1, 7, 1, 7, 1, 7, 1, 7, 1, 7, 1, 5, 1, 1, 1, 7, 1, 7, 1 , 7, 1, 5, 1, 5, 1, 5, 1, 5, 1
Energy of 40Ar ions and SRIM ranges
Target thickness
Total dose on the target (ions)
47 mm
4.8*1011
97 mm
1.2*1011
500MeV/u 23.6 mm 800MeV/u 47.74 mm
Long-lived nuclides generated in copper
Nuclide
Half-life
Nuclide
Half-live
60Co
5.27 y
58Co
70.92 d
22Na
2.6 y
7Be
53.3 d
54Mn
312.5 d
59Fe
44.5 d
57Co
271.8 d
51Cr
27.7 d
65Zn
244.1 d
48V
15.97 d
46Sc
83.83 d
56Ni
6.1 d
56Co
78.8 d
52Mn
5.59 d
Spatial distribution of activity of different nuclides in the copper target after 40Ar E0 = 800 MeV/u irradiation
1E-8 8E-9 6E-9 4E-9
46
2E-9
Activity, (Bq / (mm * p.p.))
7
Sc 46 Sc 58 Co 58 Co
1E-9 8E-10 6E-10 4E-10
63
Be ( Cu) 7 63 40 Be ( Cu + Ar) 7 Be
Experiment Fluka Fluka 58
Co
2E-10
7
Be
1E-10 8E-11 6E-11 4E-11
46
Sc
2E-11 1E-11 8E-12 6E-12 4E-12 2E-12 0
20
40
60
80
Depth in the copper target, (mm)
100
Spatial distribution of activity of different nuclides in the copper target after 40Ar E0 = 500 MeV/u irradiation 4E-9 46
Sc 46 Sc 58 Co 58 Co
Activity, (Bq / (mm * p.p.))
2E-9 1E-9 8E-10 6E-10 4E-10
7
63
Be ( Cu) 7 63 40 Be ( Cu + Ar) 7 Be
Experiment Fluka Fluka 58
Co
2E-10 1E-10 8E-11 6E-11 4E-11
7
Be
2E-11 1E-11 8E-12 6E-12 4E-12
46
Sc
2E-12 0
20
Depth in the copper target, (mm)
40
Calculation of ranges with FLUKA and ATIMA
14
2
Energy loss, (MeV/(mg/cm ))
12
10
500 MeV/u, ATIMA 800 MeV/u, ATIMA 500 MeV/u, FLUKA 800 MeV/u, FLUKA
8
6
4
2
0 0
1
2
3
4
Depth in the copper target, (cm)
5
Distribution of activity of different nuclides in the copper target after 40Ar E0 = 800 MeV/u irradiation 7.00E-08
Total activity:
Experiment
6.00E-08
• Experiment 1.75E-07 • FLUKA 8.90E-08
FLUKA
Activity, (Bq / p.p.)
5.00E-08
4.00E-08
3.00E-08
2.00E-08
1.00E-08
0.00E+00 Be-7
Sc-46
Cr-51
Mn-54 Residual nuclides
Co-56
Co-57
Co-58
Distribution of activity of different nuclides in the copper target after 40Ar E0 = 500 MeV/u irradiation 1.80E-08 1.60E-08
Total activity:
Experiment
1.40E-08
• Experiment 4.14E-08 • FLUKA 2.26E-08
FLUKA
Activity, (Bq / p.p.)
1.20E-08 1.00E-08 8.00E-09 6.00E-09 4.00E-09 2.00E-09 0.00E+00 Be-7
Sc-46
Cr-51
Mn-54 Residual nuclidce
Co-56
Co-57
Co-58
Radial distance, (cm)
Prompt dose rate around FRS target with concrete wall and without wall
Radial distance, (cm)
µSv/h
1GeV/u 238U beam, intensity 109 p/s, irradiation time 4 weeks
Radial distance, (cm)
Remanent dose rate around FRS target with concrete wall and without wall with a cooling 1 hour
Radial distance, (cm)
µSv/h
1GeV/u 238U beam, intensity 109 p/s, irradiation time 4 weeks
Radial distance, (cm)
Remanent dose rate around FRS target with concrete wall and without wall with a cooling 1day
Radial distance, (cm)
µSv/h
1GeV/u 238U beam, intensity 109 p/s, irradiation time 4 weeks
