a lithium borate thermoluminescence dosimeter with 0.3 wt% of manganese impurityconcentration was prepared for high dose levels in the range of 1-30 kgy for gamma irradiation applications.the tld reader was used for read out purposes from ambient temperature to about 400°c with a heating rate of 6°c/sec. the pre- and post- irradiation anneal temperature was 300°c for 1.5 and 1 hours respectivel...

Gafchromic EBT (International Specialty Products, NJ, USA), radiochromic film is one of the newest radiation-induced auto-developing x-ray analysis films available for therapeutic radiation dosimetry in radiotherapy applications. Part of any radiochromic film product which undergoes a polymerization reaction for automatic darkening is an associated post-irradiation colouration whereby the film ...

Introduction: Radioresistant tumors are often characterized by hypoxia and have been associated with reduced patient survival [1]. Applying a priming dose of radiation to radioresistant tumors may be associated with reoxygenation of previously hypoxic areas and increased tumor radiosensitivity [2]. Single-fraction radiotherapy has been shown to control murine tumor xenografts via a mechanism de...

In this paper we report synthesis of Au-SnO2 nanocomposite by nano-joining. It involves synthesis of Au and SnO2 colloids separately followed by post irradiation of mixed Au-SnO2 colloids. We have used 532 nm and 1064 nm wavelengths of a pulsed Nd:YAG laser and different post irradiation time. The post irradiation by 532 nm laser light results in formation of Au-SnO2 nanocomposite by nanojoinin...

Therapeutic irradiation of the brain is a common treatment modality for brain tumors, but can lead to impairment of cognitive function. Dendritic spines are sites of excitatory synaptic transmission and changes in spine structure and number are thought to represent a morphological correlate of altered brain functions associated with hippocampal dependent learning and memory. To gain some insigh...

Tumour recurrence frequently occurs after radiotherapy, but the characteristics, intratumoural localization and post-irradiation behaviour of radioresistant cancer cells remain largely unknown. Here we develop a sophisticated strategy to track the post-irradiation fate of the cells, which exist in perinecrotic regions at the time of radiation. Although the perinecrotic tumour cells are original...

BACKGROUND The rat model of radiation-induced carcinogenesis is widely used to estimate breast cancer risk, but it is unknown whether mammary terminal end buds (TEBs), the hypothesized target of chemical carcinogens, are also targets of radiation-induced carcinogenesis. MATERIALS AND METHODS Female Sprague-Dawley rats were irradiated with X-rays (2 Gy). The morphology, bromodeoxyuridine (BrdU...

The reaction of the pituitary gland sexual glands chain is established by quantitative changes in LH, FSH and estradiol concentrations together with morphological studies of ovaries. Sexually immature female pigs, aged 2 months, were irradiated with single doses of 1.5 and 2.5 Gy. The controlled hormonal parameters were monitored up to the onset of sexual maturity. Early post-irradiation studie...

OBJECTIVE Fiber post is cemented to a root canal to restore coronal tooth structure. This research aims to evaluate the effect of ultraviolet (UV) irradiation on bond strength of fiber post with resin cement. MATERIALS AND METHODS A total of 40 of the two types of fiber posts, namely, FRC Prostec (FRC) and Fiber KOR (KOR), were used for the experiment. UV irradiation was applied on top of the...