*Article* **Dosimetric Characterization of DSF/NaOH/IA-PAE/***R.* **spp. Phantom Material for Radiation Therapy**

**Damilola Oluwafemi Samson 1,2,\* , Ahmad Shukri 1, Nurul Ab. Aziz Hashikin <sup>1</sup> , Siti Hajar Zuber 1, Mohd Zahri Abdul Aziz 3,\*, Rokiah Hashim 4, Mohd Fahmi Mohd Yusof <sup>5</sup> , Nor Ain Rabaiee <sup>6</sup> and Sylvester Jande Gemanam <sup>7</sup>**

	- <sup>5</sup> School of Health Sciences, University Sains Malaysia, Kota Bharu 16150, Malaysia
	- <sup>6</sup> Department of Radiology, Kulliyyah of Medicine, International Islamic University, Kuantan 25200, Malaysia
	- <sup>7</sup> Department of Physics, Benue State University, Makurdi 102119, Nigeria

**Abstract: Background:** Different compositions of DSF/NaOH/IA-PAE/*R.* spp. composite particleboard phantoms were constructed. **Methods:** Photon attenuation characteristics were ascertained using gamma rays from 137Cs and 60Co. Absorbed doses at the location of an ionization chamber and Gafchromic EBT3 radiochromic films were calculated for high-energy photons (6 and 10 MV) and electrons (6, 9, 12, and 15 MeV). **Results:** The calculated TPR20,10 values indicate that the percentage discrepancy for 6 and 10 MV was in the range of 0.29–0.72% and 0.26–0.65%. It was also found that the relative difference in the *dmax* to water and solid water phantoms was between 1.08–1.28% and 5.42–6.70%. The discrepancies in the determination of PDD curves with 6, 9, 12, and 15 MeV, and those of water and solid water phantoms, ranged from 2.40–4.84%. Comparable results were found using the EBT3 films with variations of 2.0–7.0% for 6 and 10 MV photons. Likewise, the discrepancies for 6, 9, 12, and 15 MeV electrons were within an acceptable range of 2.0–4.5%. **Conclusions:** On the basis of these findings, the DSF/NaOH/IA-PAE/*R.* spp. particleboard phantoms with 15 wt% IA-PAE addition level can be effectively used as alternative tissue-equivalent phantom material for radiation therapy applications.

**Keywords:** dosimetric properties; tissue-equivalent phantom; absorbed dose; IA-PAE; radiation therapy
