Konnai Akiko, Nariyama Nobuteru, Ohnishi Seiki, Odano Naoteru, Ozasa Naoto, Ishikawa Yuhzoh
National Maritime Research Institute, Mitaka, Tokyo 181-0004, Japan.
Radiat Prot Dosimetry. 2006;120(1-4):125-8. doi: 10.1093/rpd/nci527. Epub 2006 Apr 13.
A 2-D tissue-equivalent sheet-type dosemeter (NTL sheet) was developed using thermoluminescent material of LiF:Mg,Cu,P (NTL-250). The energy responses of the NTL sheet and NTL-250 powder were measured with 10-150 keV monoenergetic photons from synchrotron radiation at SPring-8. The sample was irradiated by a rotational method for the uniform irradiation with the narrow beam. Linearity of the NTL-250 was confirmed up to 2 Gy. Energy responses of the NTL sheet and NTL-250 powder were close to that of soft tissue. On the other hand, the BaSO(4) sheet, which has been used practically, showed the response that the sensitivity approximately 60 keV was 100 times higher than that for (60)Co gamma rays. Therefore the NTL sheet can be said to have excellent properties for dose measurements.
利用LiF:Mg,Cu,P（NTL - 250）热释光材料研制了一种二维组织等效片状剂量计（NTL片）。在SPring - 8利用同步辐射产生的10 - 150 keV单能光子测量了NTL片和NTL - 250粉末的能量响应。通过旋转法对样品进行照射，以实现窄束均匀照射。NTL - 250在高达2 Gy时的线性得到了确认。NTL片和NTL - 250粉末的能量响应接近软组织的能量响应。另一方面，实际使用的硫酸钡片显示出其在约60 keV时的灵敏度比钴 - 60γ射线高约100倍的响应。因此，可以说NTL片在剂量测量方面具有优异的性能。
