One sample identical
in shape and weight with the irradiated samples
was used as reference sample. UVA (UV Light Meter,
YK-35UV Lutron Electronics Co., Inc., USA) and UVB
(Solarmeter model 6.2 UV meter, Solartech, Inc.,
USA) dosimeters were used to measure total UVB
and UVA exposure doses. The measurements were
made with a precision of 5%. The exposure doses
for different wavelengths were calculated using the
spectral characteristic of a UV lamp. The samples
were stored at low temperature (41C) before
extraction.