International Journal of Radiation Research
نشریه پرتو پژوه
Int J Radiat Res
Basic Sciences
http://ijrr.com
79
journal79
2322-3243
2345-4229
10.61186/ijrr
en
jalali
1386
9
1
gregorian
2007
12
1
5
3
online
1
fulltext
en
Production of an economic high-density concrete for shielding megavoltage radiotherapy rooms and nuclear reactors
Radiation Biology
Radiation Biology
تحقيق بديع
Original Research
<strong>Background:</strong> In megavoltage radiotherapy rooms, ordinary concrete is usually used due to its low construction costs, although higher density concrete are sometimes used, as well. The use of high-density concrete decreases the required thickness of the concrete barrier hence, its disadvantage is its high cost. In a nuclear reactor, neutron radiation is the most difficult to shield. A method for production of economic high-density concrete with appropriate engineering properties would be very useful. <strong>Materials and Methods:</strong> Galena (PbS) mineral was used to produce of a high-density concrete. Galena can be found in many parts of Iran. Two types of concrete mixes were produced. The water-to-concrete (w/c) ratios of the reference and galena concrete mixes were 0.53 and 0.25, respectively. To measure the gamma radiation attenuation of Galena concrete samples, they were exposed to a narrow beam of gamma rays emitted from a cobalt-60 therapy unit. <strong>Results:</strong> The Galena mineral used in this study had a density of 7400 kg/m3. The concrete samples had a density of 4800 kg/m3. The measured half value layer thickness of the Galena concrete samples for cobalt- 60 gamma rays was much less than that of ordinary concrete (2.6 cm compared to 6.0 cm). Furthermore, the galena concrete samples had significantly higher compressive strength (500 kg/cm2 compared to 300 kg/cm2). <strong>Conclusion:</strong> The Galena concrete samples made in our laboratories had showed good shielding/engineering properties in comparison with all samples made by using high-density materials other than depleted uranium. Based on the preliminary results, Galena concrete is maybe a suitable option where high-density concrete is required in megavoltage radiotherapy rooms as well as nuclear reactors.
High-density concrete, galena, shielding, megavoltage radiotherapy.
143
146
http://ijrr.com/browse.php?a_code=A-10-1-249&slc_lang=en&sid=1
S.M.J.
Mortazavi
mmortazavi@sums.ac.ir
79003194753284600850
79003194753284600850
Yes
M.A.
Mosleh-Shirazi
79003194753284600851
79003194753284600851
No
M.R.
Maheri
79003194753284600852
79003194753284600852
No
H.
Yousefnia
79003194753284600853
79003194753284600853
No
S.
Zolghadri
79003194753284600854
79003194753284600854
No
A.
Haji-pour
79003194753284600855
79003194753284600855
No