辐射变色膜片对质子剂量响应的实验标定
Calibration of dose response of radiochromic film to protons
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摘要: 利用串列静电加速器产生的5~9 MeV的质子束对HD-810型辐射变色膜片（RCF）进行了标定。用分光光度计和普通的商用平板扫描仪对辐照后的RCF透过率进行了测量，得到了光学密度变化随RCF灵敏层吸收剂量的变化曲线。标定实验结果表明:在一定的吸收剂量范围内,RCF的光学密度变化与RCF灵敏层中吸收剂量成线性关系，并且与质子能量无关。测量光学密度所用光源的波长对线性范围的大小有较大影响，绿光(532 nm)比红光(670 nm)有更大的剂量探测范围。Abstract: The calibration of radiochromic films (HD-810) irradiated by protons with different energies has been carried out on the tandem electrostatic accelerator. The optical densities of the irradiated films were obtained using spectrophotometer and commercial flatbed scanner, and the curves of the net optical densities versus dose were acquired. The results of calibration corroborate that, in a certain range of absorbed dose, the net optical densities vary linearly with absorbed doses of the sensitive layer and are independent on the energy of protons. The wavelength of light used to measure the optical density has great effect on the linear range, and the linear range of green light (532 nm) is obviously larger than that of red light (670 nm).
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Key words:
- radiochromic film /
- optical density /
- absorption dose /
- dose response /
- calibration
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