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首頁(yè)> 外文期刊>Nuclear Science, IEEE Transactions on >A Rotating Scatter Mask for Inexpensive Gamma-Ray Imaging in Orphan Source Search: Simulation Results
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A Rotating Scatter Mask for Inexpensive Gamma-Ray Imaging in Orphan Source Search: Simulation Results

機(jī)譯：用于廉價(jià)孤兒伽瑪射線成像的旋轉(zhuǎn)散射掩模來(lái)源搜索：模擬結(jié)果

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The Rotating Scatter Mask (RSM) system is an inexpensive retrofit that provides imaging capabilities to scintillating detectors. Unlike traditional collimator systems that primarily absorb photons in order to form an image, this system primarily scatters the photons. Over a single rotation, there is a unique, smooth response curve for each defined source position. Testing was conducted using MCNPX simulations. Image reconstruction was performed using a chi-squared reconstruction technique. A simulated 100 uCi, Cs-137 source at 10 meters was detected after a single, 50-second rotation when a uniform terrestrial background was present. A Cs-137 extended source was also tested. The RSM field-of-view is 360 degrees azimuthally as well as 54 degrees above and 54 degrees below the horizontal plane. Since the RSM is built from polyethylene, the overall cost and weight of the system is low. The system was designed to search for lost or stolen radioactive material, also known as the orphan source problem.
機(jī)譯：旋轉(zhuǎn)散射掩模（RSM）系統(tǒng)是一種廉價(jià)的改造，可為閃爍的探測(cè)器提供成像功能。與傳統(tǒng)的準(zhǔn)直儀系統(tǒng)主要吸收光子以形成圖像不同，該系統(tǒng)主要散射光子。在一次旋轉(zhuǎn)中，每個(gè)定義的源位置都有一條獨(dú)特的平滑響應(yīng)曲線。使用MCNPX模擬進(jìn)行測(cè)試。使用卡方重建技術(shù)執(zhí)行圖像重建。在存在統(tǒng)一的地面背景的情況下，旋轉(zhuǎn)50秒后，在10米處檢測(cè)到了模擬的100 uCi，Cs-137源。還測(cè)試了Cs-137擴(kuò)展源。 RSM視場(chǎng)角為水平360度，以及在水平面上方54度和下方54度。由于RSM由聚乙烯制成，因此系統(tǒng)的整體成本和重量很低。該系統(tǒng)旨在搜索丟失或被盜的放射性物質(zhì)，也稱為孤立源問(wèn)題。

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