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http://dx.doi.org/10.7733/jnfcwt.2015.13.1.55

Development of the IRIS Collimator for the Portable Radiation Detector and Its Performance Evaluation Using the MCNP Code  

Ji, Young-Yong (Korea Atomic Energy Research Institute)
Chung, Kun Ho (Korea Atomic Energy Research Institute)
Lee, Wanno (Korea Atomic Energy Research Institute)
Choi, Sang-Do (Korea Atomic Energy Research Institute)
Kim, Change-Jong (Korea Atomic Energy Research Institute)
Kang, Mun Ja (Korea Atomic Energy Research Institute)
Park, Sang Tae (Kongju National University)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.13, no.1, 2015 , pp. 55-61 More about this Journal
Abstract
When a radiation detector is applied to the measurement of the radioactivity of high-level of radioactive materials or the rapid response to the nuclear accident, several collimators with the different inner radii should be prepared according to the level of dose rate. This makes the in-situ measurement impractical, because of the heavy weight of the collimator. In this study, an IRIS collimator was developed so as to have a function of controlling the inner radius, with the same method used in optical camera, to vary the attenuation ratio of radiation. The shutter was made to have the double tungsten layers with different phase angles to prevent the radiation from penetrating owing to the mechanical tolerance. The performance evaluation through the MCNP code was conducted by calculating the attenuation ratio according to the inner radius of the collimator. The attenuation ratio was marked on the outer scale ring of the collimator. It is expected that when a radiation detector with the IRIS collimator is used for the in-situ measurement, it can change the attenuation ratio of the incident photon to the detector without replacing the collimator.
Keywords
IRIS collimator; Radiation detector; Dose rate; Radioactivity; MCNP code;
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