Abstract
Experiments were carried out in order to obtain information required for establishing transfer coefficients of gaseous iodine (I2) to rough rice, brown rice and polished rice. The gaseous iodine deposited on young rice plants before the heading period was scarcely found in the rough rice harvested at the full ripe stage. The biological half life of iodine in hull, however, was much slower than that in leaves of 14 days. The translocation of iodine from leaves and stalks to rough rice was not clearly recognized. Therefore, it was deduced that iodine found in brown rice mainly should originate from that deposited on the hull. The distribution ratios of iodine between rough rice and brown rice, and between brown rice and polished rice were 100:4 and 100:30 on 100 grains basis, respectively. If average normalized deposition velocity (Vd(m)) or derived deposition velocity (Vs) are given, the transfer coefficients of gaseous iodine to rough rice (TFr), brown rice (TFb) and polished rice (TFp) could be calculated.
