Patent ID: 8378291

Claim:
A metal volume source calibration phantom, disposed inside a monitor having a plurality of radioactivity detectors received inside an accommodation space formed inside the monitor, the metal volume source calibration phantom comprising: a container; a plurality kinds of metal plates stacked up inside the container; and at least one slab of radioactive source, each disposed between the adjacent metal plates and comprising a plurality of radionuclides, wherein by means of inserting different numbers of the plurality kinds of metal plates inside the container, it is capable of obtaining the metal volume source calibration phantoms with different densities, wherein each of the metal plates is made of stainless steel, aluminum, or a combination thereof; wherein when the container is a metal box, one of the metal plate in the metal box is made of aluminum sheet, the aluminum sheet has a net weight of 13.2 kg, a density of 0.34, and shows a nuclide counting efficiency (%) of 19.3, 25.2 and 39.5 when the radioactive source is Cs-137, Mn-54 and Co-60, respectively; one of the metal plate in the metal box is made of stainless steel sheet, the stainless steel sheet has a net weight of 38.2 kg, a density of 0.99, and shows a nuclide counting efficiency (%) of 14.6, 19.8 and 33.7 when the radioactive source is Cs-137, Mn-54 and Co-60, respectively; and one of the metal plate in the metal box is made of combination of stainless steel sheet and aluminum sheet, the combination of stainless sheet and aluminum sheet has a net weight of 51.4 kg, a density of 1.33, and shows a nuclide counting efficiency (%) of 12.7, 12.8 and 30.3 when the radio active source is Cs-137, Mn-54, and Co-60, respectively; and wherein when the container is a metal drum, one of the metal plate in the metal drum is made of aluminum sheet, the aluminum sheet has a net weight of 70.0 kg, a density of 0.34, and shows a nuclide counting efficiency (%) of 10.0, 15.9 and 35.6 when the radioactive source is Cs-137, Mn-54 and Co-60, respectively; one of the metal plate in the metal drum is made of stainless steel sheet, the stainless steel sheet has a net weight of 239.6 kg, a density of 1.17, and shows a nuclide counting efficiency (%) of 4.2, 7.2 and 19.9 when the radioactive source is Cs-137, Mn-54 and Co-60, respectively; and one of the metal plate in the metal drum is made of combination of stainless steel sheet and aluminum sheet, the combination of stainless sheet and aluminum sheet has a net weight of 368.0 kg, a density of 1.80, and shows a nuclide counting efficiency (%) of 2.0, 3.5 and 11.3 when the radio active source is Cs-137, Mn-54, and Co-60, respectively.