But on Friday the Ministry of Defence published the results
of an inquiry
set up last year under Cambridge University scientist Professor Peter
Lachmann, which it said showed the public had not been put at risk.
"The Ministry of Defence welcomes the main conclusion of the
report that
there was no danger to public health arising from the release of zinc
cadmium sulphide as an air movement tracer in the trials," said junior
Defence Minister Baroness Symons in a statement.
"We are also reassured by the report's findings that, in the
areas where
these trials took place, there is no evidence of increased incidence of
diseases associated with cadmium toxicity."
The trials, carried out by scientists from Britain's germ warfare
research
centre at Porton Down, in Wiltshire, south west England, were aimed at
finding out how vulnerable the UK was to a chemical or biological attack.
To assess how far a cloud of chemical agents would travel the
scientists
decided to disperse the chemical marker agent zinc cadmium sulphide. These
fluorescent particles could be traced and counted at numerous sampling
points.
Between 1953 and 1964 large quantities of the chemical were
sprayed over
Britain from the ground and the air. The trials began in the south of
England but were later widened to cover most regions of England and Wales.
The experiments came to light in the late 1990s, when the Ministry
of
Defence admitted that since they were conducted doubts had surfaced over the
safety of zinc cadmium sulphide.
http://www.abcnews.go.com/wire/World/reuters20000324_1976.html