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Nowadays, a wide variety of medical procedures make use of electromagnetic radiations. UV and X-rays are the most commonly employed. UV rays are used in phototherapy to treat different dermatologic diseases. Generally, patients are irradiated with UVA or UVB rays; the target of the exposure can be a small area of the skin or the whole body surface. In the past few years, several studies reported long term side effects of phototherapy. In radiotherapy, X-rays are employed for cancer treatment: a controlled dose is delivered to a localized region of the patient to kill the tumour. One of the most important objectives of radiotherapy treatments is to deliver the prescribed dose to the tumour and a minimum dose to the surrounding tissues. In recent years, treatment planning systems have become increasingly complex. The increasing complexity of the technology requires a corresponding increase in the sophistication of the verification of the treatment plan and its delivery. For these reasons, monitoring the dose and its spatial distributions is essential in phototherapy and radiotherapy treatments. The focus of this thesis was to develop a new chemical dosimeter that was tissue-equivalent, reusable and that could measure the 3D spatial distribution of the absorbed dose.