TY - JOUR ID - TI - Design and Creating a Specific Neutron Irradiation Instrument to Decrease the User’s Radiation Exposure Time AU - Ahmed Ghanim Muslim AU - Asia H. Al-Mashhadani PY - 2023 VL - 64 IS - 1 SP - 166 EP - 173 JO - Iraqi Journal of Science المجلة العراقية للعلوم SN - 00672904 23121637 AB - A specialized irradiation instrument "created instrument" was designed andcreated from various kinds and sizes of available plastic household-waste materials.In addition, a neutron beam collimator with a lid was designed and implemented.The collimator is with dimensions of 25 cm in height and 10 cm in inner diameter,while the lid dimensions are 11.5 cm height and outer diameter of 9.9 cm toperfectly match the inner diameter of the collimator with the possibility ofmovement (opening and closing), and also the shielding of the radioactive 241Am/Beneutron source with a recent activity of 37.5 mCi.To investigate the efficiency of the "created instrument", ten hydrogenous materialsamples (ordinary paraffin of chemical structure CnH2n+2) with the same cylindricaldimensions (Ø = 8.5 cm, 0.5 cm thickness) and with the same weight of 20 g ±0.005 for each, were used with and without the "created instrument". The neutronmeasurements were slowed (4.7 – 1.58 n/s) when the paraffin sample thickness wasprogressively increased (0 – 5 cm). Most importantly, the "created instrument" waseffectively contributed to reducing the user’s radiation exposure time fromapproximately 90 seconds to a few seconds no longer than 30 seconds for eachmeasurement with considerable reduction ratio of 66.67% by making the samples ofthicknesses ranging from 0.5 cm to 5 cm easier to position on the neutron beamcollimator compared without using the "created instrument". It may also be utilizedto evaluate the moderation on-site for different materials in neutron source shieldingthickness based on the measuring procedures and data gathered. It is predicted thatthis study will help future improvements to use additional techniques to satisfy moreprotection related to the radiation field.

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