A comparison of thermal neutron and gamma ray sensitivities of common TLD materials

Ayyangar, Komanduri M.; Lakshmanan, A.; Chandra, Bhuwan; Ramadas, K

doi:10.1088/0031-9155/19/5/007

Cited by 80 publications

(15 citation statements)

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“…However, the thermal neutron response of TLD-600 is about 1400 greater than that for TLD-700. 12 Therefore, for neutrons thermalized in the Bonner sphere the equations simplify to…”

Section: Dose Analysismentioning

confidence: 99%

In vivo and phantom measurements of the secondary photon and neutron doses for prostate patients undergoing IMRT

2006

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For intensity modulated radiation therapy (IMRT) treatments 6 MV photons are typically used, however, for deep seated tumors in the pelvic region, higher photon energies are increasingly being employed. IMRT treatments require more monitor units (MU) to deliver the same dose as conformal treatments, causing increased secondary radiation to tissues outside the treated area from leakage and scatter, as well as a possible increase in the neutron dose from photon interactions in the machine head. Here we provide in vivo patient and phantom measurements of the secondary out-of-field photon radiation and the neutron dose equivalent for 18 MV IMRT treatments. The patients were treated for prostate cancer with 18 MV IMRT at institutions using different therapy machines and treatment planning systems. Phantom exposures at the different facilities were used to compare the secondary photon and neutron dose equivalent between typical IMRT delivered treatment plans with a six field three-dimensional conformal radiotherapy (3DCRT) plan. For the in vivo measurements LiF thermoluminescent detectors (TLDs) and Al2O3 detectors using optically stimulated radiation were used to obtain the photon dose and CR-39 track etch detectors were used to obtain the neutron dose equivalent. For the phantom measurements a Bonner sphere (25.4 cm diameter) containing two types of TLDs (TLD-600 and TLD-700) having different thermal neutron sensitivities were used to obtain the out-of-field neutron dose equivalent. Our results showed that for patients treated with 18 MV IMRT the photon dose equivalent is greater than the neutron dose equivalent measured outside the treatment field and the neutron dose equivalent normalized to the prescription dose varied from 2 to 6 mSv/Gy among the therapy machines. The Bonner sphere results showed that the ratio of neutron equivalent doses for the 18 MV IMRT and 3DCRT prostate treatments scaled as the ratio of delivered MUs. We also observed differences in the measured neutron dose equivalent among the three therapy machines for both the in vivo and phantom exposures.

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“…However, the thermal neutron response of TLD-600 is about 1400 greater than that for TLD-700. 12 Therefore, for neutrons thermalized in the Bonner sphere the equations simplify to…”

Section: Dose Analysismentioning

confidence: 99%

In vivo and phantom measurements of the secondary photon and neutron doses for prostate patients undergoing IMRT

2006

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“…7 After that, the pair of TLD-600 ( 6 LiF:Mg,Ti) and TLD-700 ( 7 LiF:Mg,Ti) was successfully introduced for personnel neutron monitoring. [8][9][10] LiF:Mg,Cu,P has also been studied for the said purpose by several researchers. 11,12 However, these dosimeters suffer from many disadvantages, such as their complex glow curve structure, complicated annealing procedure, loss of sensitivity upon reuse and retention of the residual signals.…”

Section: Introductionmentioning

confidence: 99%

Development of LiMgBO₃:Tb³⁺ as a new generation material for thermoluminescence based personnel neutron dosimetry

et al. 2021

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“…Hence the instrumental response correction will be unnecessary. Based on earlier studies (Ayyangar et al 1974), the PL from F~-centres in TLD-100 can be shown to be nearly 45 times more efficient than that of TL of the 200 ° C peak from the point of view of discriminative measurement of radiations of high SID in mixed fields. On the contrary, for the 656nm PL from F 2 centres, this discrimination factor will be lower since the 656 nm to 521 nm PL intensity ratio is lower for thermal neutrons.…”

Section: --'Ii)mentioning

confidence: 91%

Photoluminescence ofF-aggregate centres in thermal neutron irradiated LiF TLD-100 single crystals

et al. 1997

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A comparison of thermal neutron and gamma ray sensitivities of common TLD materials

Cited by 80 publications

References 10 publications

In vivo and phantom measurements of the secondary photon and neutron doses for prostate patients undergoing IMRT

In vivo and phantom measurements of the secondary photon and neutron doses for prostate patients undergoing IMRT

Development of LiMgBO₃:Tb³⁺ as a new generation material for thermoluminescence based personnel neutron dosimetry

Photoluminescence ofF-aggregate centres in thermal neutron irradiated LiF TLD-100 single crystals

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A comparison of thermal neutron and gamma ray sensitivities of common TLD materials

Cited by 80 publications

References 10 publications

In vivo and phantom measurements of the secondary photon and neutron doses for prostate patients undergoing IMRT

In vivo and phantom measurements of the secondary photon and neutron doses for prostate patients undergoing IMRT

Development of LiMgBO3:Tb3+ as a new generation material for thermoluminescence based personnel neutron dosimetry

Photoluminescence ofF-aggregate centres in thermal neutron irradiated LiF TLD-100 single crystals

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Development of LiMgBO₃:Tb³⁺ as a new generation material for thermoluminescence based personnel neutron dosimetry