ABSTRACT
Background: The radiation risks to workers, public and to the environment that may arise from unsafe practices have to be assessed and, if necessary, controlled. Objective: The study is aimed to assess procedural radiation protection measures and to explore challenges faced by radio-diagnostic centres on safety operations of radiation protection practices. Method: A prospective cross-sectional survey was conducted among 26 radio-diagnostic workers in some centres in Gombe State, Nigeria. The questionnaire consists of three sections which include socio-demographic and work related information, procedural safety and safety operations. The data were analyzed using SPSS version 20.0 and descriptive statistics such as frequency and percentage were obtained. Results: More than two-third of the respondents, 61.5% (n=16) closed their x-ray room door during exposure and majority of the respondents, 92.3% (n=24) always move the patient’s feet away from the couch or table during positioning of the ambulant patient for upper extremity. Those respondents that use gonadal shield on patient’s were 26.9% (n=7). Majority of the respondents 76.9% (n=20) don’t have a radiation safety officer/radiation safety adviser (RSO/RSA) at their facility. More than two-third of the respondents, 80.8% (n=21) have never attended any training. All the participants 100% (n=26) have no radiation exposure monitoring device at their facility. Conclusion: Procedural safety was adequate in all the facilities, except for the non-usage of the gonad shied by almost all of the respondents, while safety operations are poor in most of the radio-diagnostic centres.

ABSTRACT
The move towards a de-carbonised world, driven partly by climate science and partly by the business opportunities it offers, will need the promotion of environmentally friendly alternatives, if an acceptable stabilisation level of atmospheric carbon dioxide is to be achieved. The use of natural resoucses that have not any air pollution or greenhouse gases and provides comfortable coexistence of human, livestock, and plants. The greenhouses require air conditioning process to control their temperature and relative humidity to suit specific plants. To achieve this goal, a novel air humidifier and/or dehumidifier systems using mop fans had been designed and employed in an experimental greenhouse to evaluate its performance under a controlled environment. The mop fan help to reduce the energy consumption of the greenhouse whilst providing a pleasant environment for the plants inside the greenhouse. The system was designed taking into account the meteorological conditions, which affect the environment inside the greenhouse. The performance of the system was monitored over a period of time by measuring the temperature and relative humidity of the greenhouse. Results of the monitoring have shown that the system was able to provide comfortable conditions (temperatures of 16-26oC and relative humidity of 65%) suitable for the plants grown in the experimental greenhouse. This device enable to minimse the temperature variation and, hence, avoided the hazard of any sudden climatic change inside the greenhouse.