Determination of radon-222 concentration in buildings at Universiti Teknologi Mara, Jengka, Pahang using solid state nuclear track detector (SSNTD), CR-39 / Wan Nur Adila Wan Deraman

Assesment for the indoor radon concentration and the annual effective dose
in buildings at UiTM, Jengka, Pahang have been done. CR-39 have been
used as the detector of Radon. The detectors with diameter of 1 cm x 1 cm
were distributes at the comer of the buildings with the selected of 16 places.
The CR-39 were exposed to radon for 30 days. After retrieved the CR-39, it
have undergo the etching process using 6M of sodium hydroxide solution at
the temperature of 70°C for 5 hours. Then, the spots of the track of CR-39
were analysed by using the optical microscope. The radon concentration and
the annual effective dose were calculated by using the formula. The radon
concentration in these locations ranges from 7.42 Bqm_3 until 30.12 Bqm)
with an average of 17.11 ± 6.53 Bqm_3 which is below the action limit of
ranges 200-600 Bq/m3 (ICRP, 1993). The ranges of annual effective dose in
these buildings were found to be 0.08 mSvy·l until 0.76 mSvy·l with the
average values 0.319 mSvy·l which is below the action limit of 3 mSvy·l
(ICRP, 1993). Thus, UiTM, Jengka, Pahang is not in radiological risk and
the people safe to live there.