http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/217 Assistant Professor, PUC Campus, Aizawl 2026-04-29T22:09:33Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/831 Title: Measurement of indoor concentrations of radon and thoron in Mizoram, India Authors: Vanchhawng, Lalmuanpuia Abstract: Radon, thoron and their progenies as a natural radiation hazards to human health is well known. These gases are present in the environment and their level of concentration depends upon geographical and geological conditions, meteorological factors, etc. The indoor radon/thoron concentration is also influenced by building materials, ventilating system and soil gas diffusion. Measurement of radon/thoron concentration in Mizoram is reported in this paper covering three districts, namely Aizawl, Kolasib and Champhai. In this study, we used solid-state nuclear track detectors to obtain the time integrated concentration levels of indoor radon/thoron. The study was conducted by measuring the cumulative exposure for a period of about 90 days each in 149 houses during rainy season (May-August). Houses were selected on the basis of geological characteristics of the area and the construction types in order to determine variation of concentrations of radon and thoron due to these factors. Among the three districts, Champhai District had the highest radon/thoron concentrations, while Kolasib District had the maximum thoron concentration. Among the different types of houses, concrete building had the average maximum concentration of radon followed by Assam type building with G.I. Sheet walls while the contribution due to asbestos walls of Assam type building was found to be lowest. 2010-01-24T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/830 Title: Radon and the risk of lung cancer in Aizawl district, Mizoram, India Authors: Vanchhawng, Lalmuanpuia Abstract: Aizawl district chhûngah hian radon tam lam teh a ni a. Kan tehna hmanrua atân chuan Solid State Nuclear Track Device (SSNTD) hman a ni. He SSNTD hi a bika siam plastic cylinder, a hming atâna ‘dosimeter’ an tih chhûngah dahin radon aṭanga lo chhuak alpha particles te hnuhma (nuclear track) a lo chhinchhiah a. He nuclear track tam lam hi Govt. Zirtiri Residen-tial Science College laboratory-ah Spark counter hmanga chhiar a ni. Sik leh sa, hun pui hrang hrang, fûr, thlasik leh nipui chhûnga Aizawl district bikah in sak dân chi hrang hrang chhûnga radon tam lam danglam dân he report-ah hian târ lan a ni. Chu bâkah, in sakna hmun ram leilung awm dân te azir pawh lantir tel a ni bawk. Radon hian chuap cancer a thlen thei tih finfiah a ni tawh a; meizial tih lohah chuan a thlentu nasa ber a ni hial. India ramah hian Aizawl district hi a mi chêng tam lama teha mipa leh hmeichhe zinga chuap can-cer nei tam ber pakhatna ve ve hauhtu a ni. He chuap cancer tam êm êmna chhan hi radon boruak vâng a ni thei ang em tih chu he report hi a khuh hawnna atân kan hmang dâwn a ni 2010-06-20T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/829 Title: Measurements of the equilibrium factor of radon in Aizawl, Mizoram, India Authors: Vanchhawng, Lalmuanpuia Abstract: Radon (222Rn), being a radioactive gas has its parent nucleus originated from 238U. From 238U there is a series of 14 decays to form a stable nucleus of 206Pb. The equilibrium factor in its simple term may be defined as ratio of the amount of progeny nucleus to that of a parent nucleus. Measurement of Equilibrium Factor (F-factor) for radon has been carried out in 24 dwellings in Aizawl City, which were specifically selected according to the site location and materials used for construction of the dwellings. In measuring F-factor for radon we have made use of absorber-mounted nuclear track detectors (LR-115) which selectively register the tracks due to alpha emissions from 214Po which is the 222Rn progeny species. This detector is termed as DRPS (direct radon progeny sensor). DRPS is used for estimating the Equilibrium Equivalent Radon Concentration (EERC). The concentration of 222Rn is measured by using Solid State Nuclear Track Detector (LR-115) mounted in a BARC type twin cup dosimeter. The F-factor for radon is then calculated using the measured EERC and meas-ured concentrations of radon. Our measurement shows the F-factor for radon in Aizawl city is 0.3 which is close to the worldwide value (0.4) for indoor conditions. 2011-06-01T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/828 Title: MEASUREMENT OF RADON, THORON AND THEIR PROGENY CONCENTRATIONS IN MIZORAM WITH SPECIAL REFERENCE TO AIZAWL, CHAMPAI AND KOLASIB DISTRICTS Authors: Vanchhawng, Lalmuanpuia Abstract: Organisms have been continuously exposed to radiation since time immemorial. Radiation is the process of release of energetic particles or energy or waves from unstable nuclei. Radiation can be classified into ionizing and non-ionizing radiation. As the name indicated, ionizing radiation refers to the type of radiation with sufficiently high energy which has the capability to ionize atom. Non-ionizing radiations are that with lower energy sufficient only to change the rotational, vibrational or electron valence configurations of atoms. In this work, we draw more attention to ionizing radiation 2012-01-01T00:00:00Z