The share price of radiation technology group Kromek plummeted on Friday after it warned that revenue for the year ending April 30th will be "significantly below current market expectations" due to delays in a number of large contracts.These contracts include UK and US government programmes, orders from the Japanese market for nuclear detection products and further large orders in the medical and security markets.Kromek, which listed in London in October, had previously expected to break even this year but now predicts making a loss.These delays, along with the longer-than-expected set up of distribution channels for nuclear radiation products, are expected to also have an impact on the company's next financial year. "I am disappointed that we will not meet market expectations but I am confident that we will harvest real value from our technology going forward," said Chief Executive Arnab Basu."The build-up of our sales and marketing resources since the initial public offering has been slower than expected which has also been a contributory factor in the shortfall," he said.The company said it still believes that its medium-term fundamentals remain strong and its pipeline includes substantial new orders. Cash balances are also robust, it said.The stock was down 40% at 40.75p by 08:30.BC