The doses and dose rates following a LOCA in a MTR reactor have been studied. A MTR reactor is an open water pool reactor type. The water pool serves as a shield from radioactive radiations.The most serious accident in this type of reactors is the Loss of Coolant Accident (LOCA) due to rupture either of a primary coolant pipe or of any experimental beam tube. In the present work, it has assumed that pool water drains out due to double ended rupture of the tangential irradiation beam tube (TIC) which has a diameter 150 mm. For an operating power level of 22 MW, the equilibrium core would enter into melting conditions if the pool drain time is less than one hour.It was also assumed that Emergency Core Cooling System (chimney water injection system and siphon effect breaker were not working. Therefore conservatively a severe damage (~80%) is expected to occur to the core, either by a core uncover situation following extended boiling operation, or by a core covered situation with extended boiling.The reactor building, reactor hall and control room, have been modeled using the Monte Carlo N-Particle Transport code (MCNPX 2.7.0). The source term has been determined using the ORIGEN-2 code. The doses and dose rates calculations in different places of operator (as phantom of Tissue-Equivalent Material) inside of the reactor building were determined using the Monte Carlo N-Particle Transport code (MCNPX).The results show that the dose rate in the control room would be 5.24557 SV/h, the dose rate in the reactor hall above the pools on the gate would be7.20137 SV/h and the dose rate in the emergency control room would be 2.68239 SV/h. These dose rates are extremely high and would lead to fatal doses in short time.

The multiplicity correlations amongst the singly (N P) and doubly (N alpha) charged projectile fragments and the secondary charged target fragments (black, grey and shower tracks) produced in 32 S-Emulsion interactions at 3.7A and 200A GeV are studied. This aims at shedding some light on the interface of spectator and participant region. The effect of changing the energy used for 32 S-Emulsion interactions is investigated as well, indicating that the values of ˂ N P ˃ and ˂ N alpha ˃ at both incident energies have the same values within experimental errors. The impact centrality is shown to be increased with the increasing number of singly charged projectile fragments N P ,. The correlation between the mean multiplicities of secondary charged particles and both of the singly and doubly charged projectile fragments are observed. The relation between the variation of mean values of black and heavy ionized particles is observed and found to be independent of the production of singly charged fragments.