Background: The doses and biological effects of irradiated plants have been studied and reported widely. In the research

Co-60 gamma-ray source was more often used than the neutron source. However

fast neutron source is promising in such irradiation studies as it has many advantages

such as strong biological effect

high mutation rate

wide variation spectrum and stable mutant. Purpose: We aim to explore the method of dose calculation in pea samples. The biological effects of pea seeds(Pisum sativum L.) induced by different radioactive doses are to be investigated. Methods: The Needle Leaf Pea seeds were irradiated using 252Cf fission neutron source. The Monte Carlo simulation MCNP4C code was used to calculate the neutron absorbed doses and γ-rays(photons) absorbed doses in the samples. The biological effects of pea seeds induced by different radioactive doses were investigated. Results: The results showed that the flowering time of M1 generation peas was delayed with lower neutron absorbed doses(0.239-4.330 Gy)

and the germination rate was promoted with micro-absorbed doses. The seedling branch rate of M1 generation peas was elevated by neutron radiation. The harvest of M1 generation was increased with appropriate neutron doses(0.619 Gy) irradiating peas. Conclusion: After being irradiated by low neutron doses(0.239-4.330 Gy)

M1 generation peas show obvious biological effects. The research results have positive significance for the agricultural production and breeding.