currents  to  the  North  Sea,  from  where  a
small  proportion  has  entered  the  Baltic
Sea.
4.  Authorised  discharges  of  radioactivity
into  the  sea  occurring  during  the  routine
operation  of  nuclear  installations  in  the
Baltic  Sea  region  (nuclear  power  plants
and  nuclear  research  reactors)  have  also
contributed.
This  report  describes  work  carried  out  by
HELCOM’s  project  on  the  Monitoring  of
Radioactive  Substances  in  the  Baltic  Sea
(MORS-PRO)  during  the  period  1999-2006.
  Chapter  2  describes  the  sources  of
man-made  radioactivity  in  the  Baltic  Sea.
Chapter  3  describes  the  levels  of  manmade ­
  radionuclides  in  seawater,  sediments
and  biota.  Chapter  4  describes  work  on
modelling  and  evaluations  of  the  risks  to  man
caused  by  radioactivity  in  the  Baltic  Sea.
Chapter  5  compares  the  levels  of  man-made
radionuclides  in  the  Baltic  Sea  with  levels  in
other  sea  regions.  Chapter  6  summarises  the
project’s  conclusions.  Chapter  7  presents  the
consequent  recommendations,  and  work  on
data  quality  is  presented  in  the  Appendix.

References
National  Academy  of  Sciences  (1971):
Radioactivity  in  the  marine  environment
(RIME),  National  Academy  of  Sciences,
Washington  DC,  USA.
UNSCEAR  (2000):
Sources  and  effects  of  ionizing  radiation,
United  Nations  Scientific  Committee  on  the
Effects  of  Atomic  Radiation  (UNSCEAR)
Report  to  the  General  Assembly  of  the
United  Nations,  New  York.