The aim of this work is to calculate the dose released by galactic cosmic rays (GCRs) and solar energetic particles (SEPs) in the polarimeter of the Multi Element Telescope for Imaging and Spectroscopy (METIS) coronagraph [1] aboard the Solar Orbiter. This investigation is performed with a Monte Carlo method by considering the role of SEP events of proper intensity at a heliocentric distance from the Sun averaged along the spacecraft orbit. Our approach can be extended to other space missions reaching short distances from the Sun, such as Solar Probe Plus. This study indicates that the deposited dose on the whole set of polarimeter lenses and filters during ten years of the Solar Orbiter mission is of about 2000 Gy. For cerium treated lenses, a dose of 106 Gy of gamma radiation from a 60Co source causes a few percent transmittance loss.

1.
E.
Antonucci
and
METIS
Team
, “
METIS instrument proposal for the Solar Orbiter Mission
,”
Tech. Rep.
(
INAF Osservatorio Astrofisico di Torino
,
2008
).
2.
C.
Grimani
, et al,
Classical and Quantum Gravity
32
, p.
035001
,
February (2015
).
3.
T. T.
Böhlen
, et al,
Nuclear Data Sheets
120
,
211
214
,
June (2014
).
4.
A.
Ferrari
, et al,
FLUKA: A multi-particle transport code (program version 2005)
(
CERN
,
Geneva
,
2005
).
5.
C.
Theis
, et al,
volume 562, 827–829
(
2006
).
6.
V.
Vlachoudis
, “
FLAIR: A Powerful But User Friendly Graphical Interface For FLUKA
,” in
Proc. Int. Conf. on Mathematics, Computational Methods & Reactor Physics (M&C 2009)
(
2009
)
saratoga Springs
,
New York
.
7.
R.
Nymmik
, “
SEP Event Distribution Function as Inferred from Spaceborne Measurements and Lunar Rock Isotopic Data
,” in
26th Int. Cosmic Ray Conf. (Salt Lake City)
, Vol.
6
(
1999a
), pp.
268
271
.
8.
R.
Nymmik
, “
Relationships among Solar Activity, SEP Occurrence Frequency, and Solar Energetic Particle Event Distribution Function
,” in
26th Int. Cosmic Ray Conf. (Salt Lake City)
, Vol.
6
(
1999b
), pp.
280
283
.
10.
L. J.
Gleeson
and
W. I.
Axford
,
Ap. J.
154
,
1011
1026
(
1968
).
11.
Y.
Shikaze
, et al,
Astroparticle Physics
28
,
154
167
,
September (2007)
,
astro-ph/0611388
.
12.
C.
Grimani
 et al, “
Parameterization of galactic cosmic-ray fluxes during opposite polarity epochs for future space missions
,” in
30th International Cosmic Ray Conference (Merida)
(
2007
).
13.
I. G.
Usoskin
,
G. A.
Bazilevskaya
, and
G. A.
Kovaltsov
,
Journal of Geophysical Research (Space Physics)
116
, p.
2104
, February (
2011
).
14.
N.
de Simone
, et al,
Astrophysics and Space Sciences Transactions
7
,
425
434
,
September (2011
).
15.
C.
Grimani
, et al,
Classical and Quantum Gravity
29
, p.
105001
,
May (2012
).
16.
P.
Jiggens
and
F.
Cipriani
,
SolO-TEC-EES TN1/PJ
,
2014
.
17.
J.
Sørensen
,
TEC-EES-03-034/JS
,
2010
.
18.
R. A.
Mewaldt
, et al,
International Cosmic Ray Conference
2
, p.
433
(
2005
).
19.
L. W.
Townsend
and
J. S.
Neal
,
Radiation Measurements
41
,
1136
1141
(
2006
),
space Radiation Transport, Shielding, and Risk Assessment Models
.
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